There's not actually a gasket. It uses a cartridge system with rubber cups and o-rings. Your best bet is to just replace it with a good residential model.
If you're handy and you want to try to repair it there should be a set screw behind the handle that allows you to pull it off and then you can remove the cartridge. It'll probably be a hex head screw, but it could be a flat head.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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