The thing about posting on forums. You have to figure out which is BS and which is not. This is what I know to be fact. No air compresser company is going to recommend using PVC or Galvanized pipe. Their are types of plastic pipe that are OK to use, PVC is not one of them. The pressure rating for PVC is for liquid, not for a compressed gas. As far as Galvanized goes. The galvanizing will flake off, and start pluging things up. If someone has a link that says otherwise. Feel free to post it.