installing water hammer arrestors

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

  1. scrappy

    scrappy New Member

    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
  2. DonL

    DonL Jack of all trades Master of one

    Houston, TX

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

    Good Luck.
  3. Terry

    Terry Administrator Staff Member

    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

    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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