This has a fancy 90 fitting pressed in through an undersize hole, but most of them I make with silicone tubing through a tight fitting punched hole.They work nicely on muffler pressure and on crankcase pressure. The tape is Kapton - not because the film is special, that's not necessary. But it comes with a silicone adhesive, so on first application on a non-oily surface it sticks tight and spilled fuel doesn't bother it.