leaking union

Old 03-23-17, 08:43 AM
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leaking union

I had some of those copper compression fittings installed...the ones with the o rings inside.
1 of them was a 1 inch brass union. I have a tiny leak in the brass thread of the union...
can I use pipe dope or teflon on those threads for a tiny leak..??
Old 03-23-17, 09:48 AM
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The threads do not provide the seal in a union, the machined faces of the two halves of the union do. The threads only hold them tightly together. If it truly is a tiny leak, and tightening the union a bit doesn't stop it, I have had good luck with applying rectorseal or the like to the faces of the union (not the threads). While you have it separated, look for any scratches or burrs on the faces. A deep scratch, or more than a tiny seep calls for replacement.
Old 03-23-17, 12:39 PM
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What are compression unions with O-rings?
Old 03-23-17, 05:34 PM
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What are compression unions with O-rings?
I believe this is what the OP is talking about.. If so IMO you need a new O ring..

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