So I'm old-fashioned. Sue me :p
I don't use black pipe because I don't want flecks of rust traveling through the system; PVC is a shrapnel bomb waiting to happen.
What would you use in your "modern" shop?
Copper is great. It cools the air quickly so it turns the water vapor back to water so you can filter it out and it's super clean. I'll be using it in my shop!
