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Thread: Toto Ultramax fill valve won't shut off

  1. #1
    DIY Junior Member jinmalibu's Avatar
    Join Date
    Jul 2011
    Malibu, CA

    Default Toto Ultramax fill valve won't shut off

    I have a 7 yr old Toto Ultramax (model 854??). Water keeps filling into the overfill tube after flushing. If I apply pressure to the side closest to the flush handle it will stop.

    Should I start with a cap replacement or take it apart and clean it?

    Also, I started messing with it before doing any research here. I turned the plastic adjustment screw which caused the top part of the valve to lift up an inch or so and the screw went down into the valve no longer in its place. After this happened the valve shut off after flushing for a little while but is back to over flowing.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    Toto uses several fill valves...the one you likely have with the screw on the top, the screw is the height adjustment, so raising it also raised your water level in the tank...screw it back down.

    The only service you can do on that valve is to remove it and using a pair of needle nose pliers, pull out the filter screen from the bottom and clean it...if that does not fix the leaking problem (this assumes your flapper valve is not leaking), then you need to replace the valve.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Senior Member wjcandee's Avatar
    Join Date
    Apr 2012
    New York, NY


    The replacement valve that we recommend is this one: Korky MaxPeformance 528MP. (Not the white-cap 528, which won't refill your bowl enough on a Toto.)


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