Jaybee, I just completed the instillation of my compressor lines and used the PEX product. I started to use black iron or copper, but after checking the price of copper today and the labor of cutting and threading the black iron, used the PEX. It is great to work with and this new stuff is rated at 250# psi. It still will not burst but will bulge out. The price was a lot cheaper and very easy to install. I rented the tools from tool rental place here in town. Still saved a lot of $.
Roger
Roger