Rick,
Your dealer is right the gasket gets distorted, but NOT from using antifreeze-I never use it in the toilet. It seems like the gasket is a bad design especially after a few years of use. At first I thought it was because we had our TM set up at a park with the toilet charged..That wasn't the problem.Thetford as I stated earlier has no clue on the issue.
Good Luck Hopefully this gasket will last longer.
Mike
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