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Thread: Old toilet on a 3" waste line

  1. #1
    DIY Junior Member MajMetro's Avatar
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    Mar 2005
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    Portland, Oregon
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    Question Old toilet on a 3" waste line

    Can an old "large tank" (can't remember the gallonage) toilet flush properly into a 3" closet el and trunk line? I'm remodeling my basement and trying to keep my main floor bath untouched (if local code enforcers allow). My existing main line is 4" cast, but due to my new basement layout and depth of the line below my slab, I would like to run smaller 3" ABS.

    Thanks
    Last edited by MajMetro; 03-18-2005 at 01:04 PM.

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Aug 2004
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    Cave Creek, Arizona
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    Default 3"

    It was being used long before the low flush toilets were designed. In some cases it will work better than 4".

  3. #3
    DIY Junior Member MajMetro's Avatar
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    Mar 2005
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    Portland, Oregon
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    Smile 3"

    Thanks hj. Being a jack-of-all-trades and master-of-none, it's always comforting to check with a professional.

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