PVC to Copper Connection


Old 04-13-03, 01:14 PM
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PVC to Copper Connection

I attached a PVC pipe with a PVC threaded coupling to a copper threaded pipe. It leaks! I even put teflon tape on the threads. Am I forgetting something?

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Old 04-13-03, 03:14 PM
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Hello mpernice, I'm not a master plumber or anything but I have done quite a bit of plumbing where I work and one thing we do on problem joints is to put teflon tape and coat it with teflon paste, particularly "Rectorseal" works real well. Usually our problem joints are on stainless and brass, but occasionally on pvc to copper will bother as well. Some other plumbers will come along in a bit and may give you some alternate advice also so keep checking in.........Good Luck.
Old 04-13-03, 03:21 PM
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alot of times if your using a female pvc adapter they should have round washer used and usulally come with the fitting
Old 04-14-03, 09:51 PM
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You didn't mention which fitting was male and which was female, but you should definitely have MALE plastic threads and FEMALE copper threads... I would be willing to bet you are working with FEMALE plastic threads... In my experience you cannot tighten female plastic onto male copper threads because the plastic will bottom out and flare out and stretch before it ever gets appropriately tight... Also, as was mentioned, use teflon tape or pipe dope on the threads... Whatever pipe dope you use, make sure it is teflon based or it can damage the plastic fittings...
Old 04-15-03, 04:18 AM
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I had this problem on a hydronic boiler where I ran 3/4" schedule 80 for a coupon rack. I found these PVC fittings with the threaded ends reinforced with stainless ... Never a drip again.

Didn't occur to me to chage from the female PVC to male but the fittings were not that expensive. Next time I'll remember that tip though.
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