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Thread: New Lavatory P-Trap

  1. #1
    DIY Member pensfan84's Avatar
    Join Date
    Oct 2009
    Pittsburgh, PA

    Default New Lavatory P-Trap

    I'm installing a new lavatory in a fully gutted bathroom - I am able to take care of the drain and vent properly (thanks to many of you on this forum) but my question relates to the fittings for the P-trap. Everything is 1 1/2" ABS, so I am wondering which fitting I should use to connect the sink drain to the drain/vent in the wall?

    I'll need to know how to connect the p-trap to the fitting too

    I would like to use a plastic p-trap.

    I'm pretty much lost as to what to do here - potentially the easiest part of this remodel...maybe I'm over-stressed :-P

    Thanks in advance

  2. #2
    In the Trades Gary Swart's Avatar
    Join Date
    Sep 2004
    Yakima WA


    You should adapt the drain to 1-1/4. That is the standard size for a lavatory basin. These fittings are readily available at any plumbing supply store, it's call of all things, a trap adapter! You can easily recognize it, it has threads on one end and there is normally a white cap screwed to that. P traps are also easily found in the plumbing supply house. The usually come in a package, like a kit, that has all of the components you will need. Sales people usually can answer questions about traps without getting into too much trouble. After the adapter is solvent glued to the drain, everything else is hand tightened slip joints. The only place you can go wrong is with the cone shaped and thin flat washers.

    Last edited by Terry; 10-18-2013 at 02:34 PM.

  3. #3
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default slip nuts

    I ALWAYS tighten those "hand tight" connections with a pair of Channellock pliers.


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