Like a lot of people, I often forget to drain my air compressor. It’s not a big enough problem that I’m gonna shell out for a high-tech, high-dollar automatic compressor drain, but I’m willing to give this low-buck Harbor Freight version a look.
First you have to cut into the high-pressure line to install the auto drain. Once it’s installed, whenever the compressor cycles on or off and the valve notices a difference in pressure, the auto drain releases a small burst of air from the compressor.
This automatic compressor drain sells for about $10 at Harbor Freight. Other manufacturers make electric-powered versions that run from $80 to several hundred dollars — you can find those by following the street pricing link below.