Originally Posted by lakeroadster
Galvanized pipe has issues also. The galvanize will start to flake off, check out this article by Exair, very informative: Compressed Air Piping
Made me laugh when I read "vic" connections are easy. Well while it is true, I do not think many will have a grooving machine to groove the pipe before the easy installation of the actual "vic" coupling.
I have ran miles of grooved pipe, 2" to 12", copper,black iron, galv,stainless, and plastic. It is fast and easy once you have thousands of dollars of equipment purchased, lol.
Personally I like type L copper for air lines, fast simple, one time install, and easy to modify when you need another connection at a later date.