Help! I have an American Standard Cadet 3 #4021N 4.8 LPF 1.28 GPF there is a bar code # 7930956475. Have replaced all the seals. I've also replaced the lapper at least five times I've tried them all, from fluid master, American standard # 7381026-400.0070A, TOTO, Korky. My toilet flapper still leaks. I am at a loss. I want to replace the flush valve assembly in hopes that this will stop my toilet from loosing water. I don't know which one to replace it with. I suspect that the flush valve assembly that's in there is not an American standard product. I have measured the hole in the tank, it measure 4". all the flush valves with the exception of the one piece toilet flush valves are 3". Will the AS 738921-100.00toA 3-inch flush valve assembly work with this toilet? I'm about ready to replace the toilet itself. Thanks!

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