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    Sealth10's Avatar
    Sealth10 Posts: 1, Reputation: 1
    New Member
     
    #1

    Sep 5, 2009, 10:18 AM
    4" to 3" drain reduction
    Can I reduce a 4" toilet/sink drain line to 3" at the main stack? Toilet is approx 25' from stack.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
     
    #2

    Sep 5, 2009, 10:22 AM
    I'd feel a lot better if you were increasing from 3 to 4" instead of choking down from 4 to3". I wouldn't do it but let's wait until the reast of the experts chime in and see what they think.
    What say you guys? Tom
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
     
    #3

    Sep 6, 2009, 07:14 AM
    I agree with Tom... I wouldn't do it. Simply put, if someone tried to snake the drain line with a large cutter head and ran into the reduction it could definitely lead to a binding of the cable (if stuff stuck on the cutter head of the cable as it gets pulled back... picture roots from a tree) or a breaking of the sewer snake head.

    Good luck!

    MARK

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