My Craftsman air compressor (25 gallon) had a leaky bypass valve. Problem was, everyone I spoke to couldn't tell me why the air was leaking down beyond the pressure between the tank and the valves. I priced out all the parts, and they came to over $100, but couldn't guaranty this would fix my problem. The other day, I see my neighbor had tossed an old, unknown brand air compressor out in the trash to be hauled away. I saw the bleeder valves, bypass valve and pressure switch were all the same as what I had. Well, it took 2 hours and swapped out the parts with all my defective parts, and now I have a solid running air compressor. I lubed it up and tightened all the shields, and it is like a new compressor. Oh, by the way, it is 109 in the garage right now, so I am a pile of sweat but it was worth it. Expected to climb to 116 today. Hell, today is hotter than it is at the Colorado River!