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Correct cap is one that's not used and has a good rubber seal and spring . I never take the chance with a used cap unless i know it's pretty new , to easy to ruin the engine . Besides loosing all of my antifreeze on to the ground where it don't belong.I have had good luck with one that is about 13 or 14 lb. The parts suppliers in your area like NAPA or others can look it up for sure.