Water Hammer: Causes, Risks & How to Stop the Noise
A sudden bang, thud, or knocking sound from your pipes can be startling, especially when it happens every time a faucet, washing machine, dishwasher, or toilet shuts off. In many homes, this noise is caused by a plumbing condition known as water hammer. Water hammer occurs when moving water is forced to stop or change direction suddenly, creating a pressure wave that travels through the plumbing system. The resulting shock can make pipes vibrate, strike nearby framing, or produce a loud hammering sound. While an occasional mild noise may seem harmless, repeated pressure surges can place unnecessary strain on pipes, valves, fittings, and appliances. Understanding the cause is the first step toward finding the right solution.
Water hammer is sometimes confused with ordinary pipe expansion, loose plumbing, or other household noises. However, true hydraulic shock usually has a recognizable pattern because it appears when water flow stops abruptly. Fast-closing appliance valves are frequent triggers, but high water pressure, unsecured pipes, worn pressure regulators, or missing water hammer arrestors can make the problem worse. The sound may originate close to the fixture causing the problem, although pressure waves can travel and make the noise seem as if it comes from another wall or floor. That can make diagnosis confusing for homeowners. Looking at when the sound happens is often more useful than simply listening for where it seems loudest.
Modern plumbing systems contain several devices that can reduce pressure changes, but these components do not always remain effective forever. Older homes may have air chambers that gradually fill with water, while newer systems may use mechanical water hammer arrestors near quick-closing valves. A faulty pressure-reducing valve can also allow excessive household water pressure that increases the force of hydraulic shock. In other cases, the plumbing itself may simply be inadequately secured to wall framing. Because several problems can produce similar sounds, the correct fix depends on the underlying cause. Installing random parts without diagnosing the system may reduce the noise temporarily while leaving the pressure problem unresolved.
Fortunately, many causes of water hammer can be identified through relatively simple observations and checks. Noticing whether the bang occurs after shutting a specific faucet, flushing a toilet, or operating an appliance can narrow the search considerably. Checking household water pressure can reveal whether the entire plumbing system is being exposed to unusually high pressure. Inspecting accessible pipes can also show whether they are loose enough to move when valves close. Some solutions are suitable for experienced DIY homeowners, while others are better handled by a licensed plumber. Knowing the difference helps protect your plumbing and avoids turning a noisy pipe problem into a leak or damaged fitting.
This guide explains what water hammer is, why it happens, what risks it can create, and how to stop the banging noise safely. You will learn about high water pressure, water hammer arrestors, air chambers, pipe supports, appliance valves, pressure regulators, and other common parts of the plumbing system. We will also cover how to distinguish water hammer from other plumbing sounds and when professional help is appropriate. The goal is not simply to silence the noise but to correct the condition producing the pressure shock. With the right diagnosis, many water hammer problems can be reduced dramatically or eliminated before they cause more expensive plumbing trouble.
What Is Water Hammer and Why Does It Happen?
Water hammer is the common name for hydraulic shock, a pressure surge that develops when water moving through a pipe suddenly slows down or stops. Water has mass and momentum, so it cannot instantly stop moving without transferring energy somewhere in the plumbing system. When a valve closes quickly, the moving water pushes against the closed valve and creates a pressure wave. That wave travels backward through the pipe and may bounce between fittings, bends, valves, and other components. The energy can cause pipes to shake, flex, or hit nearby structural materials. The familiar hammering noise is therefore a symptom of rapidly changing water pressure rather than someone literally striking the pipes.
The speed at which a valve closes has a major influence on whether hydraulic shock develops. Traditional faucets operated by hand often close gradually enough that water flow slows before stopping completely. Solenoid valves inside washing machines, dishwashers, ice makers, and other appliances can close extremely quickly. This sudden closure gives the moving water much less time to slow down, which produces a stronger pressure wave. Modern plumbing systems often include water hammer arrestors near these fast-closing devices for this reason. If the arrestor is missing, poorly positioned, undersized, or no longer working correctly, repeated banging can occur whenever the appliance cycles.
Water velocity also influences the severity of water hammer. Water moving quickly through undersized pipes can carry more momentum and create a stronger shock when its flow is interrupted. Excessively high household water pressure can contribute to increased flow velocity and make existing hammer problems much more noticeable. This means the noise may not be caused by one faulty fixture alone. A washing machine valve may trigger the bang, but high system pressure can amplify the effect throughout the house. Correct diagnosis therefore involves considering both the fixture where water stops and the broader conditions inside the plumbing network.
Pipe material and installation affect how much sound the homeowner actually hears. Copper pipes can transmit sharp knocking noises efficiently because they are rigid and often run through framing cavities. Plastic plumbing may sound different, but it can still move or vibrate when pressure changes occur. Pipes that are poorly secured have more room to shift during a pressure surge and can strike studs, joists, or brackets. Even a relatively moderate hydraulic shock can sound severe when a pipe repeatedly hits wood or metal inside a wall. Adding proper support can reduce movement, although it does not necessarily correct the pressure surge that caused the movement.
Not every plumbing bang is true water hammer, which is why timing matters during diagnosis. If the noise occurs immediately after a valve closes, hydraulic shock is a strong possibility. Sounds that develop gradually as hot water flows may instead come from thermal expansion as pipes rub against framing. Continuous rattling can indicate loose supports, while whistling may involve a partially closed valve or flow restriction. A toilet can produce unusual noises for reasons related to its fill valve rather than classic water hammer. Recognizing the specific pattern prevents unnecessary repairs and helps you choose a solution that addresses the actual cause of the plumbing noise.
Common Causes of Water Hammer in Homes
High household water pressure is one of the most important conditions that can intensify water hammer. Residential plumbing is designed to operate within a suitable pressure range, and excessive pressure places extra stress on valves, hoses, faucets, and fittings even when no hammering noise is present. When water is moving under higher pressure, sudden valve closure can create a more forceful hydraulic shock. Homes supplied by municipal systems sometimes experience higher pressure than their internal plumbing should receive. A pressure-reducing valve is often used to regulate this incoming supply. If that valve is missing, incorrectly adjusted, or failing, water hammer may become more frequent or severe.
Quick-closing appliance valves are another very common source of water hammer noise. Washing machines and dishwashers control water using electrically operated valves that can stop flow almost instantly. Refrigerator ice makers, water dispensers, irrigation valves, and some modern plumbing fixtures can produce similar pressure changes. If you hear a bang at specific points during an appliance cycle, that appliance is an important clue. Water hammer arrestors installed close to the fast-closing valve can absorb the pressure spike before it travels throughout the plumbing system. Their location matters because an arrestor placed too far from the source may not control the shock as effectively.
Loose or inadequately supported pipes can make a relatively small pressure change sound dramatically worse. Plumbing lines should be supported at appropriate intervals while still allowing for normal movement caused by temperature changes. When a pipe is free to shift several millimeters during valve closure, it may hit studs, joists, drywall, or another pipe and create a sharp knocking noise. This physical movement is sometimes mistaken for the entire water hammer problem. Securing accessible pipes with suitable clips or cushioning materials may reduce the sound substantially. However, if a strong pressure surge remains, pipe support should be combined with correction of the hydraulic cause rather than treated as the only solution.
Older plumbing systems may rely on vertical air chambers designed to cushion pressure changes. An air chamber is essentially a capped section of pipe containing trapped air that compresses when water pressure rises suddenly. Over time, however, the air can dissolve into the water and the chamber can become waterlogged. Once filled with water, it loses much of its ability to absorb hydraulic shock because water is far less compressible than air. Some homeowners temporarily restore air to old chambers by draining the plumbing system. Modern water hammer arrestors generally provide more reliable long-term control because they use a sealed piston or diaphragm to separate the air cushion from the water.
A failing pressure regulator, faulty check valve, or other plumbing component can also contribute to unusual pressure behavior. These issues may produce water hammer throughout the home rather than at one isolated fixture. Renovations can sometimes introduce new problems if pipe sizes, valves, or appliance connections are changed without considering flow characteristics. Replacing an older slow-closing appliance with a newer model can reveal hammer that was not previously noticeable. Even changes in municipal supply pressure can affect a home that once operated quietly. When water hammer appears suddenly without an obvious fixture change, checking system pressure and major control components is often more useful than focusing exclusively on pipe supports.
How to Identify Where the Water Hammer Is Coming From
The easiest way to begin diagnosing water hammer is to pay attention to exactly when the noise occurs. Operate individual fixtures one at a time and listen for banging immediately after shutting off the water. Test bathroom and kitchen faucets, showers, toilets, washing machines, dishwashers, and any other water-using appliances you can access. If one fixture consistently triggers the sound, the problem is likely connected to that branch of the plumbing system. Automatic appliances may require waiting through a cycle until their inlet valves close. Keeping track of which events cause the noise can save considerable time compared with randomly opening walls or replacing plumbing components.
Testing hot and cold water separately can provide another useful clue. Water hammer may occur on only one supply line, particularly when an appliance or fixture is connected to both hot and cold water. If closing the cold side produces a strong bang while the hot side remains quiet, you can narrow your investigation to the cold-water branch. Washing machines are particularly useful for this type of observation because their valves operate separately during different parts of a cycle. Identifying the affected side can help determine where an arrestor or other corrective device should be installed. It can also reveal whether a particular valve is closing unusually aggressively compared with the rest of the system.
Checking water pressure is one of the most valuable diagnostic steps because it evaluates the plumbing system as a whole. An inexpensive pressure gauge can often be attached to an outdoor hose bib or another threaded connection, provided the location reflects household supply pressure appropriately. Measurements should be taken when no water is running and, when possible, observed while fixtures operate. Pressure that is consistently higher than the recommended range for your plumbing system deserves attention even if hammer is only occasional. Excessive pressure can shorten the life of supply hoses, toilet fill valves, faucets, and appliances. A plumber can confirm whether the pressure regulator requires adjustment or replacement.
Accessible plumbing should also be inspected while someone else operates the fixture that causes the noise. Watch for pipes that visibly jump, twist, or strike nearby surfaces when water flow stops. Basement ceilings, utility rooms, crawl spaces, and unfinished areas often provide the best access for this observation. Do not place your hands on pipes or fittings where movement could pinch or injure you. Instead, watch from a safe position and listen for contact between the pipe and surrounding framing. If movement is obvious, additional supports or cushioning may help, but remember that excessive movement can also be evidence of a strong underlying pressure surge.
Location can be deceptive because plumbing transmits sound extremely well through walls and framing. A loud bang near a bedroom ceiling may actually originate from a valve or pipe several meters away. Pressure waves move through the water while vibrations travel through the building structure, making the apparent source difficult to pinpoint by sound alone. This is why repeating controlled tests is more reliable than guessing based on where the noise seems loudest. If you cannot isolate the source, a plumber can use pressure testing and system knowledge to narrow the problem. Accurate diagnosis is worth the effort because the most effective water hammer fix depends heavily on where and why the pressure shock occurs.
How to Stop Water Hammer With Water Hammer Arrestors
A water hammer arrestor is specifically designed to absorb the pressure spike created when moving water stops suddenly. Inside a modern arrestor, a sealed cushion of gas is separated from the plumbing water by a piston or diaphragm. When pressure rises sharply, the internal mechanism compresses and absorbs part of the hydraulic energy before it can travel through the pipes. This makes arrestors especially effective near washing machines, dishwashers, and other fixtures with fast-closing valves. Unlike traditional air chambers, properly designed mechanical arrestors do not normally become waterlogged in the same way. They are therefore one of the most reliable solutions for recurring fixture-specific water hammer.
Placement is critical when installing a water hammer arrestor. The device generally works best when positioned close to the valve that creates the sudden pressure change. Installing an arrestor on a distant pipe may provide less protection because the pressure wave has already traveled through a significant section of plumbing before reaching it. Washing machine arrestors are often available with threaded connections that fit between the supply valve and appliance hose. Other applications may require an arrestor installed directly into the plumbing line. The correct size and configuration depend on pipe diameter, flow conditions, fixture type, and manufacturer instructions, so installation should never be based solely on visual similarity.
Some homeowners can install screw-on washing machine arrestors relatively easily because they connect much like standard supply hoses. The water supply must be turned off before disconnecting anything, and old washers or damaged hose fittings should be inspected at the same time. After installation, connections should be checked carefully for leaks when the water is restored. Built-in arrestors for dishwashers, toilets, or concealed plumbing may require more advanced work involving valves, fittings, or wall access. If soldering, cutting pipe, or modifying permanent plumbing is required, professional installation is often the safer choice. A correctly installed arrestor should reduce pressure shock without creating new leak points.
An arrestor is not always the complete solution when the plumbing system has excessive water pressure. Installing several arrestors while leaving dangerously high supply pressure unchanged may reduce noise without addressing the condition placing stress on every fixture in the home. Similarly, an arrestor will not stop a pipe from rattling if the pipe itself is inadequately supported. The best approach is to identify whether the problem involves local hydraulic shock, system-wide pressure, pipe movement, or a combination of these factors. A washing machine that produces the only bang in an otherwise properly regulated system is a strong candidate for a local arrestor. Multiple fixtures producing hammer suggest a broader evaluation may be necessary.
Water hammer arrestors can eventually wear or fail, although quality devices are designed for long service. If a plumbing system that previously operated quietly begins hammering near an existing arrestor, the device may no longer be absorbing pressure effectively. Before replacing it, confirm that household water pressure has not changed and that nearby valves or pipes have not developed other problems. An arrestor should also be installed in the correct orientation if the manufacturer specifies one. Replacing a failed unit can restore quiet operation when all other conditions remain normal. Treat arrestors as one part of a properly designed pressure-control system rather than a universal cure for every type of plumbing noise.
Can High Water Pressure Cause Water Hammer?
High water pressure can make water hammer considerably more severe because it increases the energy moving through the plumbing system. Although pressure and flow velocity are not exactly the same thing, excessive supply pressure often contributes to conditions that produce stronger hydraulic shock. Fixtures can also discharge water more rapidly when pressure is high, causing greater momentum before a valve closes. The result may be louder banging and stronger pipe movement. Even if the hammer appears only at one appliance, checking overall household pressure is worthwhile. Correct pressure protects the entire plumbing system, not just the location where noise is currently noticeable.
A home may receive high pressure directly from the municipal water main, especially in areas where elevation changes require utilities to maintain substantial distribution pressure. Residential plumbing systems commonly use a pressure-reducing valve to lower incoming pressure to a safer and more manageable level. This regulator is usually installed near the point where the main water supply enters the property. Like any mechanical component, it can wear out or become incorrectly adjusted. When that happens, household pressure may gradually increase without the homeowner immediately noticing. Water hammer, running toilets, dripping faucets, and prematurely failing appliance hoses can all provide clues that pressure deserves investigation.
Pressure gauges provide a practical way to determine whether high pressure is contributing to the problem. A gauge attached to an appropriate hose connection can show static pressure when no fixtures are running. Some gauges also record peak pressure, which can reveal temporary spikes that a single quick reading might miss. Pressure can change during the day depending on municipal demand and other factors, so one measurement is not always the entire story. If readings are unusually high or inconsistent, a plumber can evaluate the pressure regulator and related components. Adjusting pressure should be done carefully because excessively low pressure can create its own usability problems throughout the home.
A closed plumbing system can also experience pressure increases caused by thermal expansion when water heats inside a water heater. Check valves, pressure-reducing valves, or backflow devices can prevent expanding water from pushing back into the public supply. Without an appropriate expansion-control device, pressure may rise as heated water expands. This condition is not exactly the same as classic water hammer, but it can increase stress on plumbing and complicate pressure symptoms. Expansion tanks are commonly used in closed systems to provide space for this increased volume. A plumber can determine whether thermal expansion is contributing to abnormal pressure readings or recurring plumbing noises.
Reducing excessive supply pressure can sometimes eliminate or dramatically reduce water hammer without adding arrestors at every fixture. In other homes, proper pressure regulation reduces the severity but a fast-closing appliance still needs a local arrestor. This is why a system-wide diagnosis is more effective than assuming one solution fits every case. Household pressure, pipe size, valve closing speed, plumbing layout, and pipe support all interact. Correcting excessive pressure also provides benefits beyond noise reduction by reducing strain on appliances and plumbing components. If hammer occurs throughout the house, checking pressure should be one of the first serious diagnostic steps rather than an afterthought.
Loose Pipes, Air Chambers and Other Water Hammer Fixes
Loose pipes can amplify water hammer by converting pressure movement into physical impact against framing. When accessible pipes visibly shift during valve closure, adding appropriate supports may reduce noise substantially. Pipe clamps, clips, and cushioning should secure the line without damaging it or preventing necessary thermal movement. Different pipe materials require different spacing and support methods, so generic fastening should be avoided. Over-tightening rigid supports can sometimes create new noises as pipes expand and contract with temperature changes. The goal is controlled movement rather than locking every section so tightly that the plumbing cannot respond naturally to changing temperatures.
Where a pipe passes through a stud, joist, or other structural material, contact can create tapping or knocking even without severe hydraulic shock. Protective sleeves or suitable cushioning may prevent the pipe from striking or rubbing against the opening. Access can be the biggest challenge because many noisy sections are hidden inside finished walls and ceilings. Opening drywall simply to chase an uncertain noise is rarely the best first step. Start with pressure checks, fixture testing, accessible supports, and arrestors at known fast-closing valves. If the problem persists and the sound clearly comes from a concealed section, professional diagnosis may prevent unnecessary demolition.
Traditional air chambers were once a common method for absorbing sudden pressure changes. These capped vertical sections of pipe contain air that compresses when pressure surges occur. Over time, however, the trapped air can dissolve into the surrounding water and leave the chamber completely filled with water. A waterlogged air chamber loses its cushioning effect and may allow hammering to return. Draining the plumbing system can sometimes restore air temporarily by emptying these chambers. Nevertheless, the improvement may not last because the air can gradually disappear again, which is one reason modern sealed water hammer arrestors are generally preferred for dependable control.
Homeowners sometimes try to stop hammer by partially closing a shutoff valve to reduce water flow. This may reduce the noise in certain circumstances, but it is not generally the best permanent solution unless the valve is specifically intended for flow control. A partially closed valve can create turbulence, whistling, reduced appliance performance, or premature valve wear depending on its design. It can also hide excessive water pressure rather than correcting it. If reducing flow appears to solve the problem, that observation is useful diagnostic information. The better long-term response is to determine whether pressure regulation, correct pipe sizing, or an arrestor is needed.
Replacing a problematic fixture valve may occasionally be appropriate when the valve itself closes unusually abruptly or has developed internal wear. Toilet fill valves, appliance solenoids, check valves, and other components can create sounds that resemble or trigger hydraulic shock. Before replacing a valve, confirm that the sound consistently appears when that particular component operates. A new valve will not solve hammer caused by high system pressure or loose pipes somewhere else. Effective plumbing repairs depend on matching the solution to the mechanism causing the noise. Combining proper pressure regulation, secure pipe support, functioning arrestors, and healthy valves usually provides far better results than relying on improvised fixes.
What Risks Can Water Hammer Cause?
Repeated water hammer places mechanical stress on plumbing components because every pressure wave pushes against fittings, valves, pipe walls, and connections. A single mild event is unlikely to cause immediate catastrophic damage in a healthy plumbing system, but years of repeated shock can contribute to wear. Weak fittings or aging connections may be particularly vulnerable. The problem deserves more attention when the hammer is strong enough to shake pipes visibly or can be felt through walls and floors. Loudness alone does not perfectly measure pressure severity, but repeated violent movement should not be ignored. Correcting the condition early is generally easier and less expensive than repairing damage after a leak develops.
Appliance hoses can also experience additional strain when water hammer occurs near washing machines or dishwashers. These flexible supply lines are exposed to repeated pressure changes every time the appliance valves open and close. High household pressure combined with hydraulic shock can increase stress on hose connections and internal appliance valves. Braided supply hoses are often more durable than older rubber designs, but no hose should be treated as indestructible. Periodic inspection for bulges, corrosion, leaks, or worn fittings remains important. Reducing the pressure shock at the source can help protect both the plumbing system and the appliance attached to it.
Valves and faucet cartridges may wear more quickly when subjected to excessive pressure and repeated shock. Toilet fill valves can also behave unpredictably in systems where pressure changes are severe. Small leaks may begin at packing nuts, threaded connections, or aging seals before a major failure becomes obvious. Water hammer does not guarantee that these components will fail, but it adds an unnecessary mechanical load to the system. Correcting high pressure and severe hydraulic shock is therefore a preventive maintenance measure as well as a comfort improvement. Quiet pipes are useful, but protecting plumbing components is the more important reason to address persistent hammer.
Pipe movement can create physical wear when plumbing repeatedly rubs against wood, metal supports, or rough openings through framing. Over many cycles, repeated contact may damage protective surfaces or loosen existing supports. Copper piping can be particularly noisy when striking framing because sound transfers efficiently through rigid metal. Plastic pipes can also move and require appropriate support. The risk depends on how much movement occurs, where the contact happens, and how the system was installed. If you can see accessible pipes jumping substantially whenever a valve closes, correcting both the movement and the pressure surge should become a priority.
The potential for water damage is ultimately the greatest concern because even a small plumbing leak can affect flooring, cabinets, insulation, drywall, and neighboring spaces. A hidden leak may remain unnoticed until staining, mold, or structural damage appears. Most homes with occasional mild water hammer will not suddenly flood, but severe repeated hammer should not be dismissed simply because the pipes have tolerated it so far. Plumbing components age, and repeated stress can expose weaknesses that were previously harmless. Treat persistent hammering as useful warning information from the plumbing system. Diagnosing it allows you to correct pressure, support, or valve problems before they become more disruptive and expensive.
When Should You Call a Plumber for Water Hammer?
Professional help is advisable when water hammer affects multiple fixtures throughout the home. This pattern can indicate excessive water pressure, a failing pressure-reducing valve, thermal expansion, or another system-wide issue rather than one local appliance connection. A plumber can measure pressure accurately, inspect the main supply arrangement, and evaluate whether existing control devices are functioning correctly. This type of diagnosis is especially important when the noise has appeared suddenly without changes to fixtures or appliances. Replacing individual arrestors throughout the house without checking the main pressure may waste money. A whole-system evaluation can reveal one central problem responsible for several different symptoms.
You should also call a plumber when water hammer is accompanied by leaks, damp walls, visible corrosion, reduced water pressure, or unusually strong pipe movement. These symptoms suggest the issue may have progressed beyond a simple noise complaint. Shut off water to any actively leaking section when it is safe and practical to do so, then arrange appropriate repair. Do not continue operating an appliance if its supply connection is leaking or moving violently. Water damage can escalate quickly, particularly inside walls or upper floors. A professional can repair the leak while also investigating whether hydraulic shock contributed to the failure.
Concealed plumbing problems are another strong reason to involve a professional. Opening walls based on sound alone can create significant repair work without guaranteeing that you will find the source. Plumbers understand how supply lines are commonly routed and can combine pressure testing, fixture isolation, and experience to narrow the likely location. If access is required, targeted opening is preferable to removing large areas of finished wall. This becomes particularly valuable in multi-story homes where noises can travel far from their actual source. Professional diagnosis may cost more initially but can save money by avoiding unnecessary demolition and incorrect repairs.
Installing or replacing a whole-house pressure regulator, expansion tank, or permanently plumbed arrestor may also require professional work. These components affect the operation and safety of the broader water supply system. Local plumbing codes may specify installation requirements, permissible materials, pressure settings, and other details. Incorrect installation can produce leaks, poor pressure, or unreliable protection. Homeowners comfortable with basic threaded connections may be able to add simple appliance arrestors, but modifying main supply piping is a different level of work. Knowing when a repair exceeds your tools or experience is part of responsible DIY maintenance.
Finally, call a plumber if you have tried reasonable basic measures but the hammer keeps returning. Persistent noise can indicate that multiple causes are interacting, such as high water pressure combined with loose piping and fast-closing valves. Solving only one factor may reduce the problem without eliminating it. A professional can evaluate the system systematically instead of continuing with trial-and-error repairs. Water hammer is usually fixable, but the best solution depends on pressure, plumbing layout, fixture behavior, and existing protective devices. Resolving those factors correctly provides quieter operation while reducing unnecessary stress throughout the home’s water system.
Frequently Asked Questions
Is water hammer dangerous?
Water hammer is not usually an immediate emergency when it is mild and occasional, but repeated strong hydraulic shock can place extra stress on pipes, valves, fittings, and appliance hoses. Persistent or severe hammering should be investigated before it contributes to leaks or component failure.
Why does my washing machine cause water hammer?
Washing machines use fast-closing solenoid valves that can stop flowing water very suddenly. A properly sized water hammer arrestor installed close to the machine supply valves can often reduce the resulting pressure shock.
Can high water pressure cause banging pipes?
Yes, excessive household water pressure can make hydraulic shock stronger and increase pipe movement. Checking the home’s water pressure and pressure regulator is especially important when several fixtures produce banging noises.
Will draining the pipes stop water hammer?
Draining the plumbing can temporarily restore air to older air chambers that have become waterlogged. However, the effect may not last, and modern mechanical water hammer arrestors generally provide a more dependable long-term solution.
Can I fix water hammer myself?
Simple tasks such as checking accessible pipe supports or installing compatible screw-on appliance arrestors may be manageable for experienced homeowners. System-wide pressure problems, concealed leaks, pressure regulator replacement, and permanent plumbing modifications are generally better handled by a qualified plumber.
