When I replaced mine I just used the same gasket as the old filter, but it would not seal. What I should have done is examined the filter base to see specifically what gasket was needed. My base has a 5/16" groove, and therefore needs a 5/16" wide flat gasket, not the 3/16" gasket that is provided with the NAPA filter or the L-shaped gasket that the old filter had. All I am saying is be sure to check the groove on the filter base to see exactly which gasket is needed. Hope this helps.
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Bill B
2007 Navigator, 45' Series 60
Full-Timing since 2004
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