---
title: Stop Banging Pipes Fast: Install a Water Hammer Arrestor
siteUrl: https://logzly.com/pipedreamdiy
author: pipedreamdiy (Pipe Dream DIY)
date: 2026-08-18T14:21:16.498965
tags: [waterhammer, plumbing, diy]
url: https://logzly.com/pipedreamdiy/stop-banging-pipes-fast-install-a-water-hammer-arrestor
---


Got a washer that turns your laundry room into a drum‑solo concert? The bang you hear isn’t a loose pipe—it’s **water hammer**, a shock wave that hits when water stops suddenly. In the next few minutes you’ll learn exactly **how to install a water hammer arrestor** so the noise disappears the first time you run a cycle.

## What Is Water Hammer?

When a valve (like the one in your washing machine) shuts quickly, the moving water slams into the pipe wall, creating a loud “hammer” sound. The fix isn’t tighter fittings or higher pressure; it’s giving that sudden surge a cushion to absorb it.

## Tools You’ll Need

- Pipe cutter or hacksaw  
- Adjustable wrench  
- Teflon (PTFE) tape  
- **Water hammer arrestor** (push‑fit brass works well)  

All of these are standard at any hardware store and cost under $20 total.

## Installing a Water Hammer Arrestor

1. **Shut off the water** – Turn the two valves behind the washer clockwise until they stop.  
2. **Relieve pressure** – Open the washer’s inlet tap and let any water drain into a bucket.  
3. **Mark the cut** – Locate the cold‑water line right where it exits the wall, about an inch from the valve.  
4. **Cut the pipe** – Use the cutter (or hacksaw) to remove the marked section.  
5. **Deburr** – Smooth the cut edges with a file or sandpaper.  
6. **Wrap threads** – Apply 2‑3 turns of Teflon tape to the male threads of the arrestor.  
7. **Fit the arrestor** – Slip it into the gap, hand‑tighten the nuts, then give each a **¼ turn** with the wrench—don’t over‑tighten.  
8. **Restore water** – Open the supply valves slowly, check for leaks, then run a wash cycle.

If the bang persists, repeat the process on the hot‑water line for extra damping.

## Testing & Fine‑Tuning

- **Listen**: After the first cycle, the noise should be gone or dramatically softer.  
- **Check for drips**: Tighten any leaking fittings a half turn at a time.  
- **Add a second arrestor** only if a faint thump remains; most homes need just one.

## Quick FAQ

**Do I need a plumber?**  
No. With the right tools and a few minutes, DIY installation is safe and reliable.

**Can I use a different size arrestor?**  
Choose an arrestor that matches the pipe diameter (½‑inch or ¾‑inch are common for washers).

**Will this affect water pressure?**  
No. The arrestor only cushions sudden stops; normal flow remains unchanged.

Silencing water hammer is as simple as adding a small cushion to your pipe system. Grab a **water hammer arrestor**, follow these steps, and enjoy a quiet laundry room without a plumber’s bill.