this has been discussed at great length here but bears doing again.
The way I remember it there is a PVC that is approved for air. The Stuff you are looking at in the big box lumberyard isn't it.
The 370 number you see on the pipe you looked at is the burst pressure, not the working pressure. Over time with fluctuations in pressure will weaken it and it will burst.
You are not talking much money so go with the black iron. I have heard that Galvinized can cause issues with air tool motors as it ages and the galvinizing starts to come off.
Also make sure you put in water traps at every major bend in the pipe.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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