installing water hammer arrestors

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by scrappy, May 26, 2014.

  1. scrappy

    scrappy New Member

    Messages:
    21
    Location:
    New York
    When installing water hammer arrestors on a washing machine, do i use teflon tape on the plastic washing machine valves? I've never dealt with plastic thread before. :confused
    Thanks
  2. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,351
    Location:
    Houston, TX

    No. It should have a washer, May / Should have a screen in it.


    Good Luck.
  3. Terry

    Terry Administrator Staff Member

    Messages:
    15,150
    Location:
    Bothell, Washington
    Never put tape on a washer thread. It just makes it harded to thread down. The rubber washer makes the seal.
  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,183
    Location:
    New England
    There are two general types of waterproof threaded joints (well, maybe a third if you consider a union threaded): tapered pipe threads that get tighter as you screw them together - these need a sealant on the threads (tape or pipe dope); and threaded joints that rely on a compression washer and use 'straight' threads. A straight thread remains the same force to continue screwing it together until the seal gets tight...continuing to tighten it, compresses that gasket and makes the seal.
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