Old toilet on a 3" waste line

Discussion in 'Toilet Forum discussions' started by MajMetro, Mar 18, 2005.

  1. MajMetro

    MajMetro New Member

    Messages:
    22
    Location:
    Portland, Oregon
    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: Mar 18, 2005
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,267
    Location:
    Cave Creek, Arizona
    3"

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

    MajMetro New Member

    Messages:
    22
    Location:
    Portland, Oregon
    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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