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Thread: mixing tanks and bowls?

  1. #1

    Default mixing tanks and bowls?

    We're remodelling a powder room and the toilet that was there was hitting the wall. The rough in is only 11", so I'm assuming it was a standard 12" toilet. (All the others in the house are standard, no problems.)

    Unfortunately there are no 10" rough in toilets that match what we want. We're looking for something "old", like the Kohler memoirs or some of the American standard stuff.

    What happens if I try to put a different tank on a 10" rough in toilet. Is there anyway to determine compatibility? Has anyone tried this when replacing a tank?

    Thanks

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    Default

    Most toilets have spec sheets that tell how much space is behind the tank.
    On a 12" rough, that may be as much as 1-1/8" or as little as 1/8"

    Some models have slim tanks ( 10" ) that allow for less space.

  3. #3
    Plumber jimbo's Avatar
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    Almost all brands today....the rough in spec is set by the TANK not by the bowl.

    Many common toilets are available in 10" rough, although the selection is limited somewhat. Toilets are a SET. You MUST get a tank and bowl which are designed to go together.

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Default tank

    As long as the new tank matches certain key dimensions, it will work. The bolt center to center dimension has to be EXACTLY the same, not just close, and the center of the flush valve to the front has to be equal or less than the original one or the seat may not stay up. IF the center of the flush valve is greater than the original one, then it may require more than a 10" rough.

  5. #5

    Default Tank

    So the slimmer tank is what makes it a 10" vs 12" rough?! That makes sense. Looks like I'm stuck with what is available.

    I measured again and i doubt i could take advantage of a 12" that had a lot of space behind the tank. looks like its just under 11 inches. Even with a 1 1/8" spec behind the tank, I think it would still touch.

    Great service. Thanks.

    Quote Originally Posted by jimbo View Post
    Almost all brands today....the rough in spec is set by the TANK not by the bowl.

    Many common toilets are available in 10" rough, although the selection is limited somewhat. Toilets are a SET. You MUST get a tank and bowl which are designed to go together.

  6. #6
    Forum Admin, Expert Plumber Terry's Avatar
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    This one can be made to work with 9-1/4"
    It uses a 10" Unifit adapter to move the bowl.
    Toto makes about seven models that work this way.

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