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Water Hammer Arrestor

Updated on February 23, 2014

Noisy pipes? Water hammer noises when you run the wash

I bought a new LG clothes washer - and every time I ran it I'd hear the water pipes rattling in the walls. This rattling sounded as loud as if someone was bouncing rocks off of my front door... the baby would wake up, my toddler would yell "who iiiiis it?", my wife's smile would disappear, and I'd check for signs of water leaking through the walls.

After reading for solutions, I settled on a product that worked for me, without requiring me to open any walls or solder copper plumbing.

This water hammer arrester cushioned the water enough that the pipes stopped bouncing off of the house frame. It quieted the washer enough that I'm allowed to do laundry during the night! :)

The metamorphosis... of a clothes washer. - Click for captions and larger view.

Click thumbnail to view full-size
Here's the clothes washer before the procedure.Both water hammer arresters installed, directly to the clothes washer.The clothes washer supply valves.  I could have installed the water hammer arresters here.  Don't forget to turn these OFF :)Don't forget a bucket to drain the supply lines into.
Here's the clothes washer before the procedure.
Here's the clothes washer before the procedure.
Both water hammer arresters installed, directly to the clothes washer.
Both water hammer arresters installed, directly to the clothes washer.
The clothes washer supply valves.  I could have installed the water hammer arresters here.  Don't forget to turn these OFF :)
The clothes washer supply valves. I could have installed the water hammer arresters here. Don't forget to turn these OFF :)
Don't forget a bucket to drain the supply lines into.
Don't forget a bucket to drain the supply lines into.

How to install a PAIR... - of water hammer arresters on a clothes washer

Arrester packaging
Arrester packaging

Install a water hammer arrester on each supply line for the clothes washer.

Time required: 10

Difficulty: easy

Cost: 20

Materials:

  • water hammer arrester for the hot supply line
  • water hammer arrester for the cold supply line

Tools:

  • channel lock pliers
  • bucket for drip water
  • towel

Instructions:

1. Turn off hot water and cold water valves for the supply lines.

You should be able to use your hands to close the two valves.

This will prevent a huge watery mess when you complete step #2.

2. Take NOTE of which one is connected to the hot water valve.

Unfasten both supply lines from the back of the clothes washer, and put them into the bucket to drain.

You might need to use the channel lock pliers to do this.

3. Fasten the water hammer arresters to the clothes washer, ensuring that the rubber gaskets are seated flat inside of the connector.Hand tighten, and then use the channel lock pliers to tighten another quarter turn.

4. Fasten the hot water supply line to the connection you noted in step #2.

Fasten the cold water supply line.

Again, hand tighten BOTH, and then use the channel lock pliers to tighten another quarter turn.

5. Turn the HOT and COLD water supply valves back ON, and test a load of laundry, listening for any signs of water hammer. If it's not all the way gone, try partially closing the HOT and/or COLD supply valve to further lessen the hammering.

Amazon stocks the proper arrester for clothes washer and refrigerator - You can add it to your cart right from here

This product is waaaay better than the plain air chambers you can buy... you don't have to solder these onto the existing copper (or plastic) plumbing... these just screw inline, between the hose and the clothes washer (or refrigerator). It took me less than 10 minutes to move the clothes washer, unscrew the supply lines, fit these arresters into place, and reattach the supply lines. I COULD have done it in less if I'd just climbed on top of the clothes dryer and reached from there :)

Don't forget lead-free!

Sioux Chief Mfg 660-H 3/4-Inch Female Swivel Hose Thread by 3/4-Inch Male Hose Thread Mini Rester
Sioux Chief Mfg 660-H 3/4-Inch Female Swivel Hose Thread by 3/4-Inch Male Hose Thread Mini Rester

This is exactly what I bought TWO of, one for the HOT and one for the COLD clothes washer supply lines. This has the 3/4" standard clothes washer size... equivalent to your standard garden hose bib.

 
Sioux Chief Mfg 660-TC1 3/8-Inch OD Compression Mini Rester Residential Water Hammer Arrester
Sioux Chief Mfg 660-TC1 3/8-Inch OD Compression Mini Rester Residential Water Hammer Arrester

This looks like the kind I'd use if my ice maker were also causing water hammer. It's got the compression fittings for the copper piping between the wall and refrigerator.

 

It's better than THIS... - This is slightly cheaper and requires much more work!

You'd have to open walls to expose your copper pipes to use this solution.

The mini-resters, recommended above, are far simpler to install and use.

AIR CHAMBER 1/2X14" COPR by SIOUX CHIEF MfrPartNo 629-WCMPK
AIR CHAMBER 1/2X14" COPR by SIOUX CHIEF MfrPartNo 629-WCMPK

I would NOT choose this product now that the "screw in line" options, above, exist.

 

Does it work for you? - Do you live with water hammer? Did you fix it? Part of it?

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    • vc hadagreatday profile image
      Author

      vc hadagreatday 3 years ago

      @SusanDeppner: Yeah, I was really scared about breaking the pipes... not anymore :)

      I guess draining the pipes might empty water from air-chambers that were already built into your existing plumbing. I wish we had air chambers built into my place!

    • SusanDeppner profile image

      Susan Deppner 3 years ago from Arkansas USA

      We had a water hammering problem with our water heater in our old house. I think draining it is what fixed it. It certainly worried me, though. I thought the pipes were going to break and flood the house!