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If the supplied o-ring is a snug fit, use it.
I wish it was. The supplied Oring and the one from the dealer arent tight enough. I suspect that the hole has become enlarged over time. I can put the pipe in and out of the hole very easily, with no resistance at all. If nothing else I will have to pack it with silicone and find the largest Oring I can out the Oring assortment kit.

* * MY 1993 JEEP GRAND CHEROKEE * * RockKrawler Long Arm Lift, 8" of total Lift, Garvin Wilderness Rack, Hella Lights, 285/75r16 Firestone Destination tires.