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Thread: Toilet w/3" flush valve into 3" drain pipe

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  1. #1

    Question Toilet w/3" flush valve into 3" drain pipe

    I've been thinking of replacing my old 5 gal/flush toilet with something like the Toto Ultramax. It apparently has a 3" flush valve. I just realized tonight that my drain lines are 3" PVC instead of 4".

    Will I have any problems using a toilet like this with my existing plumbing?

    Thanks for the help...JR

  2. #2
    Plumber BAPlumber's Avatar
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    Jul 2007
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    Vashon, Washington
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    Default no

    no problem with that.
    Brent

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
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    Sep 2004
    Location
    New England
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    Default

    The trapway is still smaller than that...the large flapper is what gives it the initial volume to get a good flush and build up a head.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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