What is the difference between a Toto C853 and a C853S? Can I use the same fill valve?

Discussion in 'Toilet Forum discussions' started by Spbphil, Jul 6, 2020.

  1. Spbphil

    Spbphil New Member

    Joined:
    Jun 16, 2007
    Location:
    California
    I see a Korky 528T Replacement TOTO Toilet Fill Valve - Fits G-Max and Power Gravity Toilets -Easy to Install -Made in USA
    1. Is my non-S a "power gravity toilet"? A G-Max?
    2. So should I buy that part OR get the generic Korky 818 that says it fits 99% of all toilets? Or do you recommend a different model fill valve?
    3. And does my Toto model take a 2" or a 3" float?

    Thanks for answers--I'm using the bathroom down the hall for now.
     
  2. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    The 528T and 818 are pretty much the same thing. And all they do is refill the tank and bowl.

    The flapper for the Ultramax that you have is 3".

    Numbers I see in the tanks are normally CST853, CST833S and CST853E
    If you have an older Ultimate, it's a 1.6 with lower overflow tube.
    The S was also 1.6 with a little higher water in the tank.
    The E is 1.28
     
  3. Sponsor

    Sponsor Paid Advertisement

     
  4. Spbphil

    Spbphil New Member

    Joined:
    Jun 16, 2007
    Location:
    California
    Hi, Terry, you are THE Best! I appreciate your authoritative answers. Here is the C853 model number from inside the toilet. (See image.) So do I have an Ultimate or an Ultramax model?

    What is the implication of having a "lower overflow tube"? Should I be trying to adjust something on the flow mechanism? The observed problem is that the water in the tank reaches just "to" the top of the fill pipe with enough surface tension that the water quietly continues to flow into the fill pipe very slowly, and the flush seems very low-flow--like a cup of water, not 1.6 liters.
     

    Attached Files:

  5. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    The water in the tank should be about 1/2" below the overflow. I sometimes see the water a little higher than that too, but it should never go up and over into the overflow unless you have a problem. It's the last resort on a failed fill valve.

    Some flappers are adjustable as to how long they float before dropping down and sealing. A lot of water passes unseen before you even notice that the flush has started. The siphon jet at the bottom of the bowl starts the flush before you even notice the rinse from above.
     
  6. Spbphil

    Spbphil New Member

    Joined:
    Jun 16, 2007
    Location:
    California

    Terry, does that mean I should adjust the new fill valve differently because my model has a "lower overflow tube"?
     
  7. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    It should be adjusted so that water isn't high enough to slop over into the overflow.

    [​IMG]
     
    Spbphil likes this.
Similar Threads: difference between
Forum Title Date
Toilet Forum discussions Toto Drake difference between fast & full flush? Aug 22, 2020
Toilet Forum discussions Difference between CST746CEMG and a Drake II? Nov 11, 2019
Toilet Forum discussions Maxwell Tank Size Difference Between 2 Models, Does it Matter? May 5, 2018
Toilet Forum discussions Fluidmaster 5403 Flapper: Any difference between red or green unit? Feb 26, 2017
Toilet Forum discussions How is the toilet made the difference between 1.28 and 1.60 GPF toilet? Feb 18, 2017

Share This Page