Toto Ultramax II 1.28 vs 1.0 GPF

Discussion in 'Toilet Forum discussions' started by mgp, May 18, 2020.

  1. mgp

    mgp New Member

    Joined:
    May 18, 2020
    Location:
    NC
    We bought an Ultramax II 1.28 based on Terry's recommendation and we like it.

    We may replace two other toilets in our house with Ultramax IIs and we are looking at the 1.0 GPF model in addition to the 1.28.

    Are the parts for the 1.0 much harder to find? From a quick internet search it seems like the 1.28 parts are a lot easier to get.

    Sorry if this has been asked before - I couldn't find it when searching the forum.

    Thanks.

    [​IMG]

    1.0 GPF

    [​IMG]

    [​IMG]

    1.28 GPF
     
    Last edited by a moderator: May 18, 2020
  2. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    The 1.0 flush valve is THU498 and the handle is THU476-CP for the right hand chrome plate handle. I don't see it listed for sale yet.

    [​IMG]

    THU498 Flush valve for the 1G

    [​IMG]
    THU474 single seal
    THU475 for ten seals

    [​IMG]

    Rotate and pull up on the flush tower to remove it. (see Ill. 3).

    [​IMG]

    Remove the grey rubber seal gasket and rinse under running water to clean. (see Ill. 4)
    Place the gasket back on the flush tower.
    Align and place the flush tower into housing and gently press to snap and to lock into place
     
    Last edited: Dec 3, 2020
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  4. mgp

    mgp New Member

    Joined:
    May 18, 2020
    Location:
    NC
    Thanks Terry.

    Maybe it’s new and parts are not available yet?

    Also this is probably a dumb question but how does the handle actuate the flush valve on the 1.0?

    On the 1.28 there is the traditional lever and chain but the 1.0 is different.

    Thanks again for the help.
     
  5. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    I'm sure the 1.0 will be available soon for parts.
    It has a cable for the flush.
     
  6. RayN

    RayN New Member

    Joined:
    Oct 4, 2017
    Location:
    Houston, TX
    Is the performance of the 1.0 GPF same or on par with 1.28 GPF version? I will be in the market soon for another Toto. Thanks
     
  7. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    Performance between the 1G and the 1.28 are pretty similar. If you want more water on the flush you can also hold the handle just a bit longer to prevent the tower from dropping down so quickly.
     
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