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jocar
Jul 10, 2013, 09:31 AM
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
Jul 10, 2013, 10:30 AM
Welcome to AMHD jocar,

There is no sealant needed on union. Attach dry.

Chuck

ma0641
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
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