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I am replacing the impeller on my DF20A. The service manual shows a gasket above and below the water pump plate and the replacement kit comes with both gaskets. But, when I removed the old impeller, there was only a gasket below the plate. The new upper gasket, when installed, extends under the impeller slightly on one side. It is not stopping rotation, but I am concerned that it will damage the impeller over time. From looking around at videos online I don't see the upper gasket installed in any of them. Has anyone run into this issue? See below for a screenshot of what I am describing. Impeller Gasket.jpg