I have a 20+ y/o 5.5 hp 25-gal upright Craftsman air compressor that I use for winterizing the sprinklers. The regulator and shut-off valves for the sprinkler are located inside a valve box near the sidewalk. After shutting the water supply ball valve, I spool up the tank pressure to 125 psi (shutoff), and set the outlet pressure to 40-50 psi, connect the air hose and open the ball valve just downstream of the regulator. I have 6 zones to purge, and I have an Orbit Wifi Controller w/Phone App which makes it easy to switch zones. The compressor keeps up, and I typically will see the outlet pressure drop to 30 psi on the last zone or two.
And being a good neighbor, my next door neighbor and the neighbor across the street get their sprinklers winterized the same day, since I have already dragged out the compressor.
And being a good neighbor, my next door neighbor and the neighbor across the street get their sprinklers winterized the same day, since I have already dragged out the compressor.