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Thread: toilet drain pipe size

  1. #1

    Default toilet drain pipe size

    can someone tell me how many toilets can be drained to a 3" abs pipe before the pipe has to be sized up?

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
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    Cave Creek, Arizona
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    25,632

    Default pipe size

    3 on 3", but once you add a fourth toilet it has to be increased to 4" at that point. Once you increase to 4" you can put more toilets on it than you probably need, or can use.

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