Review on 💧 Efficient Drain Valve: PORTER-CABLE N286039 - Keep Your Machinery Running Smoothly! by Melvin Man

Relief valves on air compressors have left hand threads. At first I didn't know what that meant, but now I do. This means the thread is receding from most other screws and bolts. The old adage "left-handed, weakling, right-handed, tight-fisted" doesn't apply here. it's back Which brings me to why I needed this little guy. My original drain valve got stuck and I screwed it in the wrong way with pliers and it broke. I took it to Home Depot to see if the mechanic could fix it. He had no idea and decided I needed a new air compressor. Went looking for Revain, found this one. They work great. There is an external screw with a normal (right-hand) thread and an internal screw/valve with a left-hand thread. You simply loosen the original outer screw with a wrench and insert it. I also added some teflon tape to make sure it seals well. Do not over tighten as this will make it difficult to turn the internal valve screw/drain. Saved me from buying a new compressor. As for 4 stars, I later found another OEM exhaust valve that is a ball valve. These little fellows are difficult to reach and turn around. They work great and are a direct replacement for the original but I think a ball valve faucet would be much easier to use and cost about the same.