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Thread: back flow flush

  1. #1
    Join Date
    Jan 2010
    Posts
    2

    Default back flow flush

    Sink drain runs into sanitary tee for toilet. How do you prevent backflow from flush? Could I install a trap before the tee?

  2. #2
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: back flow flush

    What kind of trap --- a " P " trap ?
    There is already one under the sink and you shouldn't insert another after that one in series.

    Besides ---- the sink trap is generally higher than the flood level for the toilet which is the bottom of the bowl. Any blockage preventing the toilet from draining will result in the toilet overflowing the bowl.
    "" an ounce of perception -- a pound of obscure "
    - Rush

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