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Thread: What is this?

  1. #1
    Join Date
    Jan 2014
    Location
    UT
    Posts
    12

    Default What is this?

    Can somebody tell me what this might be. I've never seen this before. The copper fitting in front of the thermal expansion valve.phphWkTORAM.jpgphpPmT5USAM.jpg
    Thanks

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  2. #2
    Join Date
    Jun 2008
    Location
    Stacy, MN
    Posts
    145

    Default Re: What is this?

    If it was installed vertically it would be to prevent/lessen water hammer. Air trapped in the top of the tube acts as a cushion. As is, they may have put it in for some future appliance.


  3. #3
    Join Date
    Mar 2007
    Location
    Columbus GA
    Posts
    3,746

    Default Re: What is this?

    Quote Originally Posted by Wayne Edwards View Post
    Can somebody tell me what this might be. I've never seen this before. The copper fitting in front of the thermal expansion valve.phphWkTORAM.jpgphpPmT5USAM.jpg
    Thanks
    It's a water hammer arrestor. BTW the air chamber is sealed so they work even when installed at any angle. Also, the device it's connected to is (most likely) a Pressure Relief Valve.
    The need for a hammer arrestor is because the PRV can close suddenly, causing water hammer.
    I can't say if it's connected properly.

    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

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