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And what does it do? My air compressor cannot get above 60 PSI, it should get to 120 psi. I noticed this piece is where I am losing pressure. Can I replace it?
Compressor cold start valve
Supposed to allow air through until certain pressure and then it closes. Basically the opposite of over pressure valve. It allows motor to start without having to build pressure for a few revolutions.
Pretty easy part to replace. Google should find you many.
I took it apart to clean, and the o-ring is shot. Will get a new o-ring tomorrow. Thanks for your help everyone!
It looks like it could be a cold start valve.
From Google: "An air compressor cold start valve bleeds air from the compressor head during the first few pump revolutions, reducing torque requirements for starting a motor. This helps the compressor start easier."
UPDATE: Changed the o-ring and it holds pressure now.
Looks like a pressure release/safety valve, and yes you can replace it. But it looks like you might want to try cleaning it out first.
Agreed, It looks fairly easy to disassemble and clean. I would attempt that before replacing. You may find a YouTube vid or two showing how. Pvc thread tape is your friend. Dirt in the valve will stop it from closings properly as pressure builds.
brass thingy