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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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