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Thread: Venting a new drain

  1. #1

    Question Venting a new drain

    Adding a new drain which consists of two sinks in my basement.
    Do not have access to the existing vent system. I must run a new
    vent to the outside of my house for this system.
    QUESTION: What is the mininum diameter pipe that can be used for this vent?

    thanks,

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,671

    Default pipe

    1 1/2" in most cases.

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