I have said this time and time again. Adjust the chain. It sounds like you need to slacken it off a little. Cadet 3s are
very sensitive to chain adjustment. Get it right and it will be trouble free for years.
My Korky flapper also came with the box opened. But it works just great. There are numerous design improvements over the OEM version. The rubber, the chain, the way the chain attaches to both the flapper and the flush mechanism, and the way the flapper attaches to the overflow tube. All better than the original.
So great, I then pulled my perfectly functioning Fluidmaster 400a and replaced it with a Korky Quietfill, just for the heck of it.
I love plumbing that much.
I like the Quietfill though. It is quieter and I like the float design.
I'm running Toto parts without the price.
But ultimately, I want a toilet that is good enough for an American... what we British call "American Standard".

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