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Thread: Is dielectric union necessary?

  1. #1
    DIY Junior Member BobinChatttown's Avatar
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    Default Is dielectric union necessary?

    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. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    Default

    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. #3
    Moderator & Master Plumber hj's Avatar
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    Brass and steel are compatible, Otherwise we could NOT use brass valves with steel piping.

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