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metal to pvc: leak help please

Posted by mrshanno (My Page) on
Mon, Nov 8, 10 at 13:51


I'm attaching a 1" threaded pvc pipe (male) to a 1" threaded metal pressure vacuum breaker backflow preveter (female) for an irrigation system. I'm getting a small drip leak where these thread together. I used teflon tape but probably only 2-3 turns of tape on the threads...Do you think I put to little tape on? I bought some of the thicker pink tape and plan to do 4-5 wraps at least. Also, how tight should I tighten the threads? I hand tightened last time and didn't use wrenches so as not to distort or break the pvc.

Thanks for any help you can give!

Follow-Up Postings:

RE: metal to pvc: leak help please

I usually don't like using thread tape on male plastic threads to metal, just some pipe joint compound. Just tighten it up good and snug, not tighten the heck out of it, and make sure it isn't cross threaded. I've seen leaks myself where thread tape was used in plastic to metal connections.--TheCapt.

RE: metal to pvc: leak help please

I agree captain. Usually where that joint is, is a hassle to get disassembled and fixed once the job is done. Over the years I've had some that never leak with tape and I've had some that no matter what I did, it would leak when using tape. A little dope properly applied and snugged in and forget about it. I'm convinced water has eyes and reasoning power and it will find a way to get out if it can.

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