Plastic Piece on inlet pipe

Discussion in 'Water Heater Forum, Tanks' started by jdon88, Aug 21, 2010.

  1. jdon88

    jdon88 New Member

    Messages:
    35
    Location:
    Pottstown PA
    What is the purpose of the plastic piece with rubber disc inside the inlet and outlet pipes? This is on a new Bradford-White heater.
  2. Jerome2877

    Jerome2877 In the Trades

    Messages:
    397
    Location:
    BC
    They are check valves to stop hot water migration through the pipes. They can cause issues as they can get build up inside them and cause flow problems. You could remove them if ya like.
  3. Mike Monett

    Mike Monett New Member

    Messages:
    6
    Location:
    Ontario
    It might be a dielectric union to prevent corrosion due to galvanic current between dissimilar metals. Check this article for more information:
    "Using A Dielectric Union To Join Galvanized And Copper Water Supply Pipes"
    http://www.hammerzone.com/archives/plumbing/systems/components/union_de/intro.htm

    Mike Monett
  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,023
    Location:
    New England
    The disk means it is at a minimum, a heat trap. It may also be a dielectric union, depending on what it is made of. Make sure that they are used in the proper location (hot/cold) as if swapped, they'll tend to block flow when you turn on a valve.
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