Can this P-Trap design save me future hassle?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by pazure, Dec 5, 2013.

  1. pazure

    pazure New Member

    Joined:
    Mar 25, 2012
    Location:
    Virginia
    I'm now working on putting together the P-trap (for bathroom sink) and connecting it to the vent stack. My question is, if I just cement a long pipe into the wall T, going straight to the P-trap, will this cause me future hassles? If I have problems that would require me to cut back the pipe towards the wall to replace defective parts, I've only got about 4" of pipe to work with before I'll have to open up the drywall to put in a new connection to the stack (what a hassle that will be).

    Rather than doing that, can I put in a NPT female or male to coupling adaptor that fits on the end of a 2" length of pipe (which I cement directly into the stack)? Then, I can use the opposite NPT adaptor which will then continue the pipe until it hits the P-Trap assembly. This way, I can always leave that 2" length with the NPT adaptor alone and simply buy the opposite NPT adaptor that would then allow me to replace everything from that point onwards.

    Thank you.
     
    Last edited: Dec 5, 2013
  2. Tom Sawyer

    Tom Sawyer In the Trades

    Joined:
    Nov 29, 2010
    Location:
    Maine
    Why not just glue a trap adapter to the trap arm sticking out of the wall?
     
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  4. pazure

    pazure New Member

    Joined:
    Mar 25, 2012
    Location:
    Virginia
    Tom,

    That's exactly what I was trying (cluelessly) to explain. Is that commonly done? Is it to code?

    Just in case things change (thread size) in the future, perhaps I should buy a couple of these adapters.
     
  5. Gary Swart

    Gary Swart In the Trades

    Joined:
    Sep 1, 2004
    Location:
    Yakima WA
    Not much point in laying in a supply of trap adapters, they are always in good supply everywhere.
     
  6. pazure

    pazure New Member

    Joined:
    Mar 25, 2012
    Location:
    Virginia
    I'm editing this post, because I've got a question about the trap adapter that Tom suggested earlier. If I do this, then will the pipe that comes out from the ensuing setup require a smaller than 1.5" pipe? Or do they make a straight-through 1.5" to 1.5" trap adapter?

    +++++++++++++++++++++

    Is the threading always going to match between manufacturers?

    Anyone know if this is to code in Virginia?

    Thanks for the responses guys.
     
    Last edited: Dec 6, 2013
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