Personally, I just went to HF and bought a couple of 100 ft rolls of 1/2 inch airline, two 50 ft hose reels, a water separator and bought a brass T fitting. I put a a reel at the front of the shop and one at the rear. I zip tied the airline so it was up hill as long as I could then down to the reels with a drop at the reel and pull air from the top and have a drain at the bottom. 300 PSI ait line. It was the safest, cheapest, easiest way I could think of to do it. When I cut the air compressor off the separator drains itself.