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Thread: Toto Ultimate bowl level low after replacing fill valve

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    Default Toto Ultimate bowl level low after replacing fill valve

    I used a Korky universal fill valve replacment in my Toto Ultimate toilet. The replacment fixed my original problem, which was that the valve sputtered and shut on and off while filling the tank. However, the water level in the bowl is too low now after flushing. If I hold down the handle, the bowl fills to the normal level. The water fill hose is clipped to the overflow tube and I can see that water is flowing steadily into the tube while the tank if filling. But it seems like the water flowing from beneath the fill valve cap fills the tank before enough water flows into the bowl through the overflow tube. The fill hose is not kinked and water flows through it freely, so I don't think it is obstructed. Could this be because I used the universal Korky fill valve instead of the one made specifically for Toto toilets?

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Where is the water level in the tank once the fill stops? If it isn't within about 1/2" of the overflow, then you need to adjust the tower to raise the tank volume.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3

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    The water in the tank fills to the correct level.

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    Moderator & Master Plumber hj's Avatar
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    If the fill valve refills the tank too quickly, it will not flow enough water through the refill tube to also refill the bow. The only remedies are to get a slower fill valve with full volume to the refill tube, or try shutting the water supply to yours so the tank fills slower, but the refill tube still delivers a full stream.

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    Switch to a fluidmaster fill valve. They're definitely not too fast.

  6. #6

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    If the fill valve refills the tank too quickly, it will not flow enough water through the refill tube to also refill the bow. The only remedies are to get a slower fill valve with full volume to the refill tube, or try shutting the water supply to yours so the tank fills slower, but the refill tube still delivers a full stream.


    Thanks for the suggestions. I will try partially shutting the water supply to see if that helps. If that fails, my plan is put the old fill valve back but replace the cap assembly with the one from the new valve. If that fails, I'm going to order a 528T fill valve. Beyond that, I'm out of ideas.

    Regarding the vaIve filling the tank too quickly, I am wondering if that is what Korky means by "Higher refill ratio for optimum performance in TOTO toilets" in the description of the 528T fill valve (I used the 528). As pointed out in other threads, Terry has reported success using the 528 in Toto toilets, but the question of what the difference is between the 528 and 528T seems to remain unanswered.

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    Forum Admin, Expert Plumber Terry's Avatar
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    The easiest fix is always to just replace the $1.99 assembly cap.
    It takes less than a minute, and costs the lest.

    http://www.terrylove.com/korky/
    Last edited by Terry; 11-01-2008 at 03:43 PM.

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