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

Posted by homebound (My Page) on
Wed, Mar 16, 11 at 10:44

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.


Follow-Up Postings:

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more info

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


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1b1 master

Turns out it's a 1B1 Master by Coast. I think I got it figured out (pull up red tab, then unscrew top, etc....)


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

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.


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

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.


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

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.


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