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I ended up buying a square of red rubber gasket material from Ace Hardware and cutting my own gasket for the cannister flush valve. Maybe not a permanent fix, but working fine so far and a lot...

So in searching the web some more I came across this: http://www.amazon.com/American-Standard-047107-0070A-Flush-Assembly/dp/B0026T2P24/ref=cm_cr_pr_product_top.

Is this any different than the one...

So I have a toilet (American Standard One-Piece 2149) with a flush value that is almost, but not quite, identical to this one. My "can" is one piece, including the top of the can, and the metal ring...