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Thread: Replace Gmax valve -have non fix type,can I replace entire assembly with Korky type?

  1. #1
    DIY Member tototalitarian's Avatar
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    Default Replace Gmax valve -have non fix type,can I replace entire assembly with Korky type?

    Hi
    This question was asked in 2009, but no response was made back then.(Ive got a Toto Drake)
    The issue is a constantly dripping vavle. Ive got the non-repairable type valve.
    here is the old thread with great pix from Terry.

    http://www.terrylove.com/forums/show...light=constant

    I want to replace the non repairable assembly with the entire Korky type assembly?
    Is this a clean replacement ? Will it fit easily ?
    Thanks Gents.
    Last edited by tototalitarian; 07-04-2011 at 09:19 AM.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    For best operation, you have three choices: replace the existing valve which is non-repairable; buy the Toto version of the Korky valve; buy the ADJUSTABLE version of the generic Korky valve. The non-adjustable Korky (they all adjust in height, but not in the water distribution) won't fill the tank and bowl properly. The adjustable one takes a few flushes to get the balance between the tank and bowl proper. The one made for Korky has that adjustment made for you. The valve senses the tank water level. If the bowl isn't filled up by the time that happens, it won't flush properly. If it overfills the bowl, it wastes water. That's why you need one that can make the balance between the bowl and tank so they both fill to capacity at the same time.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Member tototalitarian's Avatar
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    Default This appears to be the correct replacement....

    Lavelle #528T Toto Replacement Fill Valve

    Looks like it is available via Amazon or Lowes.

    Their internet instructions for replacement looks simple.

    I thought the GMAX feature was tied directly to the fill valve, but evidently the fast flush of the toto Drake is a design feature of the toilet itself and not the valve.....someone correct me if I am wrong.

    Thanks all

  4. #4
    Forum Admin, Expert Plumber Terry's Avatar
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    The flush valve and flapper are three inch. That provides the path.
    Raising the water height adds speed to the flush, some Toto products use the same 3" flush valve, change the water level and then use different flappers to only let out 1.6 or in some cases 1.28
    The fill valve refills the bowl and tank after a flush. The Korky 528 does not refill the bowl on the Toto.
    The Korky 528T has a restricter to the tank that allows the bowl to fill.
    The Korky MaxPerformance allows you to adjust the bowl fill.

  5. #5
    DIY Member tototalitarian's Avatar
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    So, Terry, which do you recommend for the Drake? The 528T or the MaxPerformance ? Thanks

  6. #6
    Retired Defense Industry Engineer jadnashua's Avatar
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    Either will work fine...it's just that the MaxPerformance one will need some tweaking out of the box to adjust the bowl/tank fill ratio (and is likely a little less money). There's a small valve on the thing to do that and it comes with instructions. The one customized for Toto works right out of the box.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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