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Old 11-07-2016, 10:50 AM   #1
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Waterproof P Trap Fittings


When installing a new P Trap, is any particular substance or material recommended on the threads of the two typically "knurled" parts that tighten up the assembly? When demo'ing old installations, I've noticed (at least it appears) that sometimes, the plumber has smeared some putty on the threads...
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Old 11-07-2016, 11:00 AM   #2
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Re: Waterproof P Trap Fittings


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Originally Posted by Curmudgeon10 View Post
When installing a new P Trap, is any particular substance or material recommended on the threads of the two typically "knurled" parts that tighten up the assembly? When demo'ing old installations, I've noticed (at least it appears) that sometimes, the plumber has smeared some putty on the threads...
I've never found it necessary on correctly assembled systems and to the best of my knowledge not recommended.
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Old 11-07-2016, 12:02 PM   #3
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Re: Waterproof P Trap Fittings


Senior is right imo also..... I've never needed or seen it. The threads really have nothing to do with the seal.

In a sense, it's a type of compression fitting between pliable plastics... make sure your washer is good and mating parts are clean... and firmly snug it up.
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Old 11-07-2016, 03:44 PM   #4
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Re: Waterproof P Trap Fittings


I used to apply a touch of rector seal on the threads of a trap if a garbage disposal was being installed. Rector seal tended to make sure the nuts did not loosen.
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