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Thread: Bathtub vent before or after p-trap

  1. #1

    Default Bathtub vent before or after p-trap

    I am putting in a new bathtub, the old install had no vent. I am 75" from main 4" stack. Can I use a wye to tie in the new vent to drain line? If so where does it go before or after the p-trap..? Nothing else is on this drain line just the tub.

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default vent

    If it was before the trap, it would not only not protect the trap from loss of seal, but would give sewer gases a direct access into the bathroom. It goes between the trap and the drain line connection.


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