used neoprene tube,
connectors and rubber grommets for all of my pitot static system. I ran
the tube from the back of the
instruments, down the left gear box, under the floor, and out the left
into the tail.
conduit or rubber
grommets protect the tube as it passes through bulkheads.
Having seen old plastic
lines become brittle and crumble, I opted for neoprene.
Pushing on the connectors is a lot easier