black iron union for gas

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by jocar, Jul 4, 2013.

  1. jocar

    jocar New Member

    Messages:
    10
    Location:
    British Columbia
    when reassembling a union on a gas water heater, is it wise to use a pipe dope or oil on the two mating surfaces of the union.
  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,121
    Location:
    Bothell, Washington
    Some do and some don't.
    Whatever works there.
    I do them dry, but that's me.
  3. frodo

    frodo New Member

    Messages:
    12
    Location:
    Mississippi
    i am a dope kinda guy, but not on brass unions
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,815
    Location:
    Cave Creek, Arizona
    I put it on the faces and the thread for the union nut.
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