Dielectric nipple needed?

Discussion in 'Boiler Forum' started by dctrjones, Nov 14, 2010.

  1. dctrjones

    dctrjones New Member

    Messages:
    2
    Location:
    Ontario, Canada
    Hello everyone,

    I've been lurking these forums for a while now and am very impressed with the wealth of information presented! Now it's time for me to ask for some advice.

    I had a new boiler installed about 4 years ago and recently have noticed one nipple that is starting to rust out. The nipple is between the backflow preventer and what I believe to be a pressure valve. The nipple at the bottom of the pic is connected to the hot pipe coming from the boiler. See the attached pic.

    Should I replace this with a dielectric nipple to avoid anymore future corrosion?

    What I find interesting is the nipple below the "pressure valve" doesn't show any signs of the similar corrosion.

    [​IMG]
  2. Terry

    Terry Administrator Staff Member

    Messages:
    14,680
    Location:
    Bothell, Washington
    Byou are going between brass and brass.
    I would use a brass nipple.
  3. dctrjones

    dctrjones New Member

    Messages:
    2
    Location:
    Ontario, Canada
    Thanks for the reply.

    Of course it needs to be brass . . . I don't know what I was thinking!

    Must have been the previous thread that got me thinking about dielectric fittings.
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