Koehler cannot build a normal cistern. They had to make one that was particularly difficult to remove and replace. This gasket is installed between the tank and the bowl. I had never messed up any of them before. The exchange works and was inexpensive, but what a PITA to install. It's not the seal, so I praise the product. Just double check that it's the right style and size for your toilet - Kohler has many different models that require different seals.
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