Fluidmaster Mark IV - repair or replace with 400A's

homeboundMarch 16, 2011

I'm dealing with a couple 4 yr old Toto's that have Fluidmaster Mark IV fill valves that are spraying out the top up to the tank lid and out. Is there a repair method you can explain for this ballcock type, or should I just replace the fill valves? Also, would 400A fill valves be better, or is there a reason they don't have 400A's to begin with?

Thanks much.

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I meant to say the water is spraying out the grooves on the wide plastic rim (not the piston itself). Thanks again.

    Bookmark   March 16, 2011 at 10:48AM
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Turns out it's a 1B1 Master by Coast. I think I got it figured out (pull up red tab, then unscrew top, etc....)

    Bookmark   March 16, 2011 at 3:49PM
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I would be inclined to just replace them.

400As are only around $10 each.

Not worth hassling with off brands or trying to even find the parts.

    Bookmark   March 16, 2011 at 4:26PM
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Agreed, and that's what I'm going to do.

But since Toto's are supposed to be so wonderfully amazing, I wonder if there was supposed to be some advantage to this thing.

    Bookmark   March 16, 2011 at 8:05PM
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Fill valves have relatively little to do with flushing performance.

They only start to operate as the water level falls.

Getting the water from tank to bowl is what determine flushing performance.

    Bookmark   March 17, 2011 at 9:39AM
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