Copper Unions - Anything on threads?

Old 11-04-07, 12:34 PM
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Copper Unions - Anything on threads?

Does anything go on the threads for copper unions?
Old 11-04-07, 12:38 PM
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Not if this is a compression fitting.
Old 11-04-07, 01:04 PM
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The only reason I would put t-tape on the union would be for anti-seize properties. It won't be needed for sealing. I hate taking things apart that bind up with double 9" pipe wrenches.
Old 11-04-07, 01:46 PM
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If the union is not a compression fitting with either a ferrule or a compression ring, than it will need either teflon tape or pipe compound.
Old 11-04-07, 08:06 PM
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a union requires nothing on the threads to seal but what i do is apply some pipe dope to the threads and make sure that the sealing surface is wiped clean. this lubricates the threads and keeps them from seizing.

Old 11-05-07, 04:08 AM
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Question Seized Threads

What can be used (other than 9" pipe wrenches) to loosen seized threads? I was all set to repair my Delta Monitor shower valve, but, cannot get the first copper coupling off to get at the valve. I put some WD40 on it yesterday and reassembled it to be able to use the shower. I have already gor the replacement parts from Delta. If I cannot free this thing up I think I am looking at replacing the entire valve.


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