Is dielectric union necessary?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by BobinChatttown, Aug 10, 2010.

  1. BobinChatttown

    BobinChatttown New Member

    Messages:
    1
    Location:
    Chattanooga, TN
    I am transitioning from galvanized to pex. The pex fitting is brass. Do I need a dielectric union, or can I just use a simple 3/4 brass pex connector?

    I have looked at numerous forums and can find no consensus on whether a dielectric fitting is necessary when transitioning to brass.

    Thanks much for help.
  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,110
    Location:
    Bothell, Washington
    To transition from galvanized to PEX, you can use either a brass or a plastic fitting.

    A dielectric is used between copper and galvanized. And not always there either. If I'm plumbing in Bellevue WA, I use a 6" brass nipple between copper and galvanized.
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,797
    Location:
    Cave Creek, Arizona
    Brass and steel are compatible, Otherwise we could NOT use brass valves with steel piping.
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