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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
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    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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