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Thread: New P trap - Help Please

  1. #1

    Default New P trap - Help Please

    Hello,

    This is a great site.

    I'm remodeling a powder room, and had to remove the P trap to install new drywall. 1 1/4 inch chrome pipe through wall looked like it was soldered into copper angle pipe. I sweated it off.

    The new pipe fits into the copper rather loosely. I'm thinking in hindsight that it probably was not solder holding the original in. (perhaps some kind of metal compound?).

    Anyway, what is the normal procedure for installing a new P trap? The Copper pipe that this fits in to is protruding approximately 1/2 inch through the new drywall. Also, as I am installing a new vanity, do I need to get the vanity in first to insure the right line-up/fit?

    Thanks so much in advance for you help.

    Bruce

  2. #2
    Engineer chassis's Avatar
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    Sep 2005
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    SE Pennsylvania
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    339

    Default

    Bruce,

    Step 1 is to install the vanity. This puts the sink tailpiece in its final position.

    Then test fit the p-trap to see how far down and over your wall pipe is. If you are lucky, you won't need any extension pieces. Most of the time you will need at most 1 vertical extension piece to get the height correct.

    The left-right relationship can be tweaked by rotating the p-trap, if your wall pipe is within about 3" either side of the vertical tailpiece. If it is more than 3", you need to get creative with tinker-toying pipe and fittings together. My recommendation is to use the minimum amount of chrome or plastic. Reason is it is very difficult to get everything tight/leak free if you have alot of slipjoints in the system. Best approach is to use copper sweated pipe and fittings starting from the wall, adding copper until you have a comfortable fit at the p-trap.

    Hard to explain to you exactly what to do without seeing your situation. If you can post some pictures it will help. The sink side is easy, the wall side is trial and error.

  3. #3
    Plumber plumber1's Avatar
    Join Date
    Aug 2005
    Location
    Florida
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    1,423

    Default p-trap

    I would sweat on the appropriate marvle. Sounds like your looking at 11/4" copper dwv. If it is get a 11/4" female c x 11/4" i.p. marvle or you could call it a trap adaptor.

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