I have a problem with the flapper valve of my low profile toilet: I have to hold the lever for about 7 seconds to get a good flush since the flapper I installed does not float the way it should. The toilet dates from about 1994 but has no manufacturer's name on it. The brass flush valve (in the picture) has the words "COAST FDRY" on the side. I stupidly managed to lose the rubber flapper and the large rubber seal that goes under the brass valve while I was doing some remodeling. I have tried a variety of generic rubber seals and flappers from my local hardware store, but none of them have helped: the flapper drops down as soon as I release the lever.
Any suggestions as to how to fix my problem?
My toilet looks rather like an Eljer Windsor 1-piece, so I wonder if one of the parts 495-5517-00 or 495-5517-00NH would work.
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A generic Korky flapper should work fine. I had the same symptoms in my AS lowboy toilet. Held the button down for months until I decided to figure out how to fix it myself since the building maintenance guys weren't going to get it right. The problem was that the building maintenance guys who installed the flapper didn't set the chain right on it. The trick to getting it to float is to pull it up high enough that it wants to float, and to pull it straight up. Just fiddle with the chain length and it will be fine.
The flappers below come with a little round thingy that you could slip over an old metal overflow tube to attach the flapper to the flush valve. You'll need to cut that off when installing yours, and just slip the ears of the flapper over the pegs that I can see on the side of your flush valve. The instructions on the box show how to do that. Just use a scissors.
You can use the black Korky flapper that every old-timey plumber uses because it's cheap and works: Model 54BP
You can get the same thing in Chlorazone, which will last longer and resist chlorine:
http://korky.com/Flapper2001BP.html I used that one for a while on my lowboy.
You can also get the one that's designed for older toilets and should float a smidge better because it has a bigger ball. That's the one I'm using now:
Avoid the one that says it's for lowboys, 92BP. It's not for your lowboy and doesn't float well. Any of those above should totally do the job for you.
PS Your old fill valve was made by Coast Foundry, now Coast Products. See the post directly above yours if you ever need a new fill valve for it.