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    jocar's Avatar
    jocar Posts: 5, Reputation: 1
    New Member
    		  
    #1

    Jul 10, 2013, 09:31 AM
    Iron pipe union
    After disassembling a black iron pipe union to change a water heater, do you use any pipe dope or oil on the mating surfaces of the union or do you reassemble it dry.
    creahands's Avatar
    creahands Posts: 2,854, Reputation: 195
    Ultra Member
    		  
    #2

    Jul 10, 2013, 10:30 AM
    Welcome to AMHD jocar,

    There is no sealant needed on union. Attach dry.

    Chuck
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
    Uber Member
    		  
    #3

    Jul 10, 2013, 11:00 AM
    This is on the gas line? Make sure to bubble leak test. A union joint is "ground" to match. Just make sure the 2 faces are clean, without corrosion.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #4

    Jul 10, 2013, 11:04 AM
    Assuming that this is a ground joint union and not a washer type. I have used pipe compound on the two surfaces.
    Although it is not required. Good luck, Tom
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