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Thread: what is the max distance from p-trap to vent?

  1. #1

    Default what is the max distance from p-trap to vent?

    I'm installing a new shower in my bathroom. I have a 2" drain that i'm building into the showerpan, and I'd like to connect into an existing drain that's about 3' from the the showers p-trap. It will be a straight run from the p-trap to the drain and I will be able to vent right above the drain and hook into it with short sweep 1/4 bend into a horizontal wye. I've read that for 1 1/2" you can have a distance of 3' 6" between ptrap and vent and for a 2" you can go up to 5' Do those distances sound correct?

    Thanks for all the help. This forum is a great resource.

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    Aug 2004
    Bothell, Washington
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    1.5" Max trap arm length is 42"

    2" trap arm length is 60"

    3" and 4" max trap arm length is 72"


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