cap is excellent no leaks when using teflon tape. No O-ring is included, but you can use your old one. After screwing by hand, use a 15/16 wrench and do not tighten more than 1/16 when it stops turning, otherwise it may crack. Just screw it tight and it won't leak. This is a trial cap. If you want to run the gauge on fuel, buy a set of electrical gauges and install them in the test port instead.
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