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Thread: Full size.

  1. #1
    Plumber canton's Avatar
    Join Date
    Jul 2005

    Default Full size.

    4" going to the sewer, the house is getting a half bath, wash machine in the basement, kitchensink, dishwasher on the 1st floor and full bath on 2nd.
    I've added up 19 fixture units which can be handled by a 3" waste in Massachusetts. I'm not sure if the inspector will want full size from the waste going out to the sewer which is 4". Can I just put a no-hub adapter, cleanout and then transition over to 3"? Or do I have to keep it 4" all the way up and out?

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

    Default sewer

    You can probably run 3" to a point outside the building, but you should install cleanouts where you make the transition, otherwise you will never be able to snake the 4" pipe using the 3" one.


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