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Left field suggestion ...Use schedule 40 PVC plastic pipe! I have an air system in my garage where I used a 2" sch.40 PVC main header in the rafters and ran 3/4" down to each air station, and then changed to 3/4" galv. pipe and threaded fitting on the walls. This is held in place with uni-strut. The PVC is cheap and easy to work with. It'll (sch.40) easily hold 175 psi air, and I used 2" main header to "help" as a reservoir. That was 2 yr.s ago, still no problems at this time, and I don't have to worry about rust in those sections of the system. My $0.02 anyway, Good Luck! ...Mark
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