You running an air dryer? If not, in my opinion you want copper in order to cool the air to let the water separator work. The recommendation is 50 feet (I used 3/4) of copper pipe before the first drop/separator otherwise you are setting yourself up for water issues. When I went with the 50 ft of 3/4 copper it solved my water issues. It was bad in the summer.

I personally would never use this stuff.