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Thread: Venting a toilet in the Wall behind the toilet but the drain is across the room?

  1. #1
    never ending repairs Weekend DYI's Avatar
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    Default Venting a toilet in the Wall behind the toilet but the drain is across the room?

    Can anyone tell me if I can add a vent only behind the Toilet and use a 3" ABS Sweeping 90 TEE to do so? The actual drain is 9 feet away across the room. See my attached Drawing.
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  2. #2
    Moderator & Master Plumber hj's Avatar
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    Your question is confusing. The pipe going up the wall behind the toilet is its vent. The other pipe will only be a legal vent if your inspector would approve it. Some would, but many would not.

  3. #3
    never ending repairs Weekend DYI's Avatar
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    So you are saying to vent behind the toilet like this is ok, even though to do it, I have to tee at the toilet flange?

  4. #4
    Test, Don't Guess! cacher_chick's Avatar
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    Your picture is not clear as to how exactly you plan to make the connection.

    The vent cannot run horizontally behind the toilet so a tee would not work. A wye would work, depending on exactly how the connections are made.

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