When running the air line I always do something like this so water has a real tough time getting into the individual drops.
___Quick connect
_______l___________________________________Main line
Of coure done my way maybe they should be called raises.LOL
In my shop I went with 3/4" black pipe. It can handle the pressure and was way!!!!!!!!!! less expensive than copper.
I had a nice piece of large diameter air hose and I used that to go from the compressor to the wall to help reduce or eliminate vibration transmission to the air lines.
I have heard of people using PVC cold water piping but make sure it can handle the pressure and the vibration.
Mike
Warning: DIY CNC may cause extreme hair loss due to you pulling your hair out.