Fluidmaster toilet fill valve. Change seal or whole valve

I have never had one of the diaphragm valves fail to shut off. The fill time just gets longer and longer and there are, ahem, "occasions" when a 5 minute cycle time on flushes is inadequate.
I will assure you as a forty year homeowner, that you experience is unique or your perception is wrong, or you are using some awesome hardware I am not familiar with. Valves failing to shut off, the constantly running toilet, is a very, very common failure.
 
i have a few old fluid master toilet fill valves laying around . So it seems its the top seal that goes bad in them and it can be replaced in 30 seconds . i saw a kit on amazon 10 for $15 .

Anyone ever just change the top diapram on one?


In this case, i would say that once the lid comes off the tank, I am replacing more than a crappy piece of rubber. In fact, the repair will get the parts cannon, if a trip to Home Depot is involved. Think about it: if this filler valve is finished, how much life is reasonably left in the flapper?
 
In this case, i would say that once the lid comes off the tank, I am replacing more than a crappy piece of rubber. In fact, the repair will get the parts cannon, if a trip to Home Depot is involved. Think about it: if this filler valve is finished, how much life is reasonably left in the flapper?
Fill valve and flapper go hand in hand i never replace one without the other
 
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