This is the Kohler seal I used in this video:
https://amzn.to/3qM5Knq

This is a universal kit that should fit a lot of brands:
https://amzn.to/3L2fUqX

Toilet Leaks from the tank when it is flushed.
This video explains step by step how to replace the flush valve gasket on a toilet. The toilet in the video is a Kohler, but the process is basically the same for most brands (toto, jaccuzi, American standard, Tuscany, crane, Moen, Delta). This is how to replace the seal when your toilet leaks from the back.

Kohler 30418 Flush Valve Gasket

Universal Toilet Tank to Bowl Repair Kit Including 2 Sponge Gaskets and 3 Set Brass Hardware Kits Fits 2 Inches 3 Inches Flush Valve Opening

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00:00 toilet leaking from the tank
00:13 Turn off the water and drain the tank
00:35 Disconnect the water supply
00:47 Remove the toilet tank
01:19 Replace the toilet tank seal
04:03 Attach the toilet tank to the bowl
05:17 Connect the water and test the toilet