Main Stack Connection

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Mark C, Jun 22, 2007.

  1. Mark C

    Mark C New Member

    Jun 21, 2007
    Hi All,

    I am doing a large addition with 4 fixtures, toilet, whirlpool tub, walk-in shower and lav. The main stack is 30' away from the farthest fixture (toilet).

    I had an outside cleanout, to the main stack, installed before this project started. Indoors, the main stack has a cleanout, that has never been used.

    I am wondering if I can put a male 4" connector on the cleanout. Then run up some 4" pvc and put a Y on it. Then connect the new drains into it.

    Or should I just cut the 4" main and put PVC and a Y onto it? The cleanout and main stack are next to each other.

    Thanks, Mark.
  2. geniescience

    geniescience Homeowner

    Nov 27, 2005
    humid summers hot, humid winters cold
    post a diagram. Draw out what else is in the house. Show your vents too.

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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    Whether the cleanout has ever been used or not is not the question. It is a cleanout and as such is not supposed to be used as a connection point, especially if it is a two way cleanout fitting in the main line.
  5. GrumpyPlumber

    GrumpyPlumber Licensed Grump

    Jun 18, 2007
    Plumber, self employed
    Licensed Grump

    Exactly...unless it's an E.C.O. - you add a new E.C.O. at the end of a wye that extends from the original place of the cleanout...also...remove the old shouldn't put a threaded fitting into it.
    If removing it turns into a a plumber, thats your waste main.
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