How to Install a Water Hammer Arrestor to Stop Banging Pipes

How to Install a Water Hammer Arrestor to Stop Banging Pipes

Advanced
3 hours
7 Steps
17 items

This guide provides comprehensive, step-by-step instructions for installing a water hammer arrestor to eliminate the loud banging noises in plumbing pipes. The process involves identifying the source of the noise, shutting off the water supply, cutting into the problematic pipe, and installing a T-fitting with an attached water hammer arrestor.

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Best for experienced DIYers and homeowners with some experience with basic plumbing knowledge. Requires MCR Safety BearKat Safety Glasses MCSCRWBK110.

Tools & Materials

Orbit Pressure Gauge 91130

Orbit Pressure Gauge 91130

The Orbit 3/4 in. female hose thread (FHT) pressure gauge is engineered to measure water pressure up to 200 psi. It is constructed from high-quality materials, including a metal case, plastic face, precision

Bucket

Bucket

Ideal for carrying or storing liquids.

FRESHFOLDS Combed Cotton Absorbent Textured 6 Piece Hand Towel Set EC100757

FRESHFOLDS Combed Cotton Absorbent Textured 6 Piece Hand Towel Set EC100757

Versatile, stylish, and functional are only a few ways to describe these bath towels. These towels are made with long cotton fibers that are looped to create a soft feel while still offering optimal absorbency

Common Problems

A clean, square cut is essential for a leak-proof seal.

Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.

Deburring copper pipe is mandatory to avoid damaging the fitting.

Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.

Failure to deburr the pipe can lead to a damaged fitting and potential leaks.

Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.

Ensure the copper pipes are thoroughly cleaned to achieve a strong solder joint.

Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.

Always deburr the inside and outside of pipes to prevent turbulence and ensure proper fitting.

Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.

These devices can be bulky and may need to be installed in a concealed location like a cupboard or under the floor.

Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.

Over-installing water hammer arrestors can cause new pipe noises or restrict flow.

Solution: Water arrestors on washing machines are not always necessary and can sometimes create their own set of noises or restrict water flow.

Frequently Asked Questions

What essential tools do I need for this project, especially for cutting and preparing pipes?

You'll definitely need an AUTOCUT 1/2 in. Copper Pipe Tubing Cutter to make clean, straight cuts. Don't forget the Husky 1-5/8 in. Inner/Outer Reamer and Deburring Tool to smooth the pipe ends, which is crucial for leak-free push-to-connect fitting installation. An adjustable wrench will also be handy for general tightening tasks.

Always start by completely shutting off the main water supply to your home and draining the pipes to relieve any pressure, which prevents unexpected floods. Wear appropriate eye protection and gloves when cutting pipes to protect against sharp edges and debris. Have a bucket and towels ready for any residual water.

This project is rated 'beginner' friendly, primarily due to the use of push-to-connect fittings which significantly simplify the installation process. You can realistically expect to complete it within the estimated 3 hours. Material costs will mainly involve the water hammer arrestor and a T-fitting, likely under $50 depending on your local store.

A common mistake is not fully deburring the pipe ends or not pushing the push-to-connect fittings all the way in until they seat firmly. Ensure the pipe is clean and smooth, and mark the insertion depth on the pipe to confirm it's fully seated before pushing. After restoring water, carefully check all new connections for any drips immediately.

Water hammer is typically a loud banging or thudding sound that occurs when a faucet or appliance (like a washing machine or dishwasher) quickly shuts off. To locate the best installation spot, identify the pipe closest to the fixture causing the noise. Installing the arrestor on the hot and/or cold supply lines near the problematic appliance, often in a vertical position, is most effective.

While push-to-connect fittings are recommended for their ease of use for beginners, you could use traditional sweat (solder) fittings or compression fittings if you have the tools and experience. The project uses The Plumber's Choice 1/2 in. Male Sweat Copper Water Hammer Arrestor Type AA HA12MS-NL, which is a piston-style arrestor suitable for most residential applications. There are also diaphragm-style arrestors available.

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3 hours | 7 Steps