Difficulty
intermediate
Time
< 2 hours
A water hammer is the loud banging noise in pipes caused when water flow suddenly stops or changes direction. This can damage your plumbing fixtures and create disruptive noises in your home. Installing Oatey’s Quiet Pipes Water Hammer Arrestors is a straightforward DIY solution designed to silence these banging pipes and protect your plumbing system.
Note: This guide concerns the application of typical bathroom piping set-ups from under the sink to the wall. For arrestors that install to the pipe, follow the installation per that type of pipe.
What Is a Water Hammer Arrestor and Why Do You Need One?
A water hammer arrestor is a device that absorbs the shock waves caused by sudden water stoppage in pipes, preventing noisy banging and potential damage. It contains air or gas that cushions pressure surges created when valves or faucets close abruptly. If you hear loud banging after shutting off appliances like washing machines or dishwashers, installing a hammer arrestor can protect your pipes and extend their lifetime.
Where Should You Install Hammer Arrestors?
Hammer arrestors should be installed as close as possible to the valves or appliances where water flow stops suddenly. Common locations include under sinks, behind toilets, or near washing machines. Positioning the arrestor near these points absorbs pressure surges immediately, reducing noise and protecting the plumbing system effectively.
What You'll Need For This Project
- Oatey Quiet Pipes Hammer Arrestor
- Adjustable or small wrench
- Replacement supply line (if necessary)
- Tee fitting (if your plumbing requires it for connections)
- Bucket to catch water
- Drying towel
Step 1. Disconnect the Water Supply
Turn off the water supply valve serving the fixture or appliance where the arrestor will be installed. Disconnect the water supply line carefully, catching any water in a bucket. Wipe the area dry before continuing.
Step 2. Attach the Hammer Arrestor
Hand-tighten the hammer arrestor onto the water stop valve or tee fitting, if necessary. The arrestor can be installed in any orientation—vertical, horizontal, or angled—to best suit your space.
Step 3. Reconnect the Water Supply
Attach the water supply line to the hammer arrestor and the fixture, hand tightening at first.
Step 4. Secure the Connection
Use a wrench to tighten all fittings snugly but avoid over-tightening, which can cause damage. Turn on the water supply and check all connections for leaks. Listen for remaining banging noises when operating the fixture.
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Tips for Successful Water Hammer Repair
- Make sure pipes and valves are securely fastened to avoid additional vibration noise.
- Hammer arrestors are low-maintenance but should be inspected periodically for leaks or damage.
- For pipe-installed arrestors or unusual plumbing layouts, consult Oatey’s specific instructions or a professional plumber.
For detailed instructions, download the official Oatey Hammer Arrestor Installation Guide.
Published on June 04, 2026
Frequently Asked Questions
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What causes banging pipes even after installing hammer arrestors?
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Banging may persist if pipes are loose, arrestors are incorrectly placed, or if the plumbing system needs additional support. Confirm arrestors are installed near the noise source and pipes are tightly secured.
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Can I install hammer arrestors myself as a DIY homeowner?
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Yes. Oatey hammer arrestors are designed for easy installation requiring only basic tools and intermediate DIY skills.
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Do hammer arrestors require any maintenance?
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Hammer arrestors generally require no maintenance. However, check fittings annually and replace the arrestor if you notice damage or leaks.
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Where can I purchase Oatey hammer arrestors?
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You can find Oatey products at plumbing supply stores and home improvement centers. Use the Where to Buy page to locate retailers near you.
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