Compressed Air Piping

I used to use nothing but copper. When it came time to plumb my home garage, I went with the RapidAir system. After using it for 8 years with no issues, I chose it for use in my new shop too. It's a seamless aluminum tube, with an HDPE (high density polyethylene) inner liner and a blue HDPE outer jacket. It's very easy to work with, bends and straightens by hand, and the compression style fittings don't leak. There are lots of accessories, manifold blocks, whatever you need. It's less money than copper, way easier to install than galvanized, and will likely outlast them both. Once you use this stuff, you'll never go back to copper.