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Thread: How to extend a CO?

  1. #1
    DIY Senior Member DavidTu's Avatar
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    Default How to extend a CO?

    I have a 45-deg Wye with a CO glued on at bottom of a drop.... problem is a new wall was added behind CO that makes access difficult. What I want to do now is extend the CO back to the face of the wall so access will be from other side of the wall. Can I do this simply by screwing in a male threaded adapter into the CO and gluing pipe and new CO onto that?

  2. #2
    Moderator & Master Plumber hj's Avatar
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    If that will do what you want, the yes, assuming it is NOT a 3 1/2" cast iron cleanout.

  3. #3
    DIY Junior Member dugfresh's Avatar
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    You will want to make sure that you use long turn radius fittings for any extension. Make sure also that the clean out at your final finished wall isn't tighter than the one that is buried.

  4. #4
    DIY Senior Member DavidTu's Avatar
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    Quote Originally Posted by hj View Post
    If that will do what you want, the yes, assuming it is NOT a 3 1/2" cast iron cleanout.
    No, but I do have another 3.5" CI CO elsewhere... I thought my building sewer CI pipe was 3" ... but I measured the floor CO to 3.5" as you suggest... does that mean my building sewer is really 3.5" or 4" or what? I sized my vents assuming it was 3"! Am I in trouble?!?

  5. #5
    Master Plumber-Gas Fitter shacko's Avatar
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    Quote Originally Posted by DavidTu View Post
    No, but I do have another 3.5" CI CO elsewhere... I thought my building sewer CI pipe was 3" ... but I measured the floor CO to 3.5" as you suggest... does that mean my building sewer is really 3.5" or 4" or what? I sized my vents assuming it was 3"! Am I in trouble?!?
    Your building sewer can be either 3or 4in., the c.o.s were made in off breed sizes to stop people from attaching pipe to them

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