Bathtub vent before or after p-trap

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by bigboxer, Oct 19, 2005.

  1. bigboxer

    bigboxer New Member

    Messages:
    4
    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. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,534
    Location:
    Cave Creek, Arizona
    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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