The "Dixon fittings" that zombywolf linked to are tapered and it looks like the fittings on the oil adapter are. I am sure some aren't. but "most" automotive applications are tapered pipe thread. Many plugs and fittings sealed with a flat gasket, o ring, or seal are straight thread and not tapered. (like a oil pan drain plug)
I don't need fancy, basic gets it done......J.I.C.works for A.N. in a carbed low pressure pinch , pipe gets it done,if you homework it right. (J.M.O) Great learning thread !
