It would be nice if they sent instructions advising you to install the gasket with a gasket installation tool or - fitting into the valve body must have the desired diameter. Please ensure the old gasket is removed when removing the old flat filter and use the sleeve and extension to insert the new gasket into the valve body. I didn't and I learned it the hard way. Luckily the 454RFE gear didn't burn out unless fluid got into it.
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