I've just purchased my first "big boy" air compressor, it's big enough to have a place in the garage and have it plumbed into a system but still small enough to wheel somewhere else on the property if needed. What's the best pipe to use for plumbing the air system? It'll be a small system, the pipe will go from the compressor vertically about 3', then turn 90 degrees to go through a wall and tee into an 18' pipe that will run the length of the garage with 3' vertical drops on either end and a tee to run back through the wall into the reloading room. I know PVC is out, I've heard steel pipe is good but it can rust (condensation is a concern in my detached, unheated garage). I've also read about using copper pipe, but I haven't worked with it much and I'm having trouble picturing how to terminate the end with threads that I can screw quick-connects onto. Anyone know about this stuff?