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  1. #1
    Join Date
    May 2009

    Default 1" threaded copper union leaking

    I'm wondering what the proper way is to install a "ELKHART 33584 UNION C TO C 1" COPPER" (or similar) fitting to keep it from leaking

    I had to replace the house water shut-off valve, and I had lots of trouble soldering due to the bending stresses of the existing pipes, so I cut the line downsteam and used a 1" copper threaded union to allow me to solder the joints in free air, then screw the last joint together.

    The union uses a simple rounded seat and mating rounded head on the two pieces, and when I first assembled the joint and turned the water on, the joint leaked profusely through the threads. I took it apart used some teflon tape wrapped partly around the thread, and partly lapping into the seat of the joint.

    After turning on the water, I got only a little slow drip, and with time it seems to be stopping.

    Is there some other trick I should have used?

    Photos attached
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