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I found this today on the shelf in my shop. Anyone know anything about them? Can anyone tell me if I am missing something from it? Any tips on using it?

I have a Campbell air compressor that's melting the plastic tube coming out of the check valve over to the unloader. What would cause this to happen? Iv noticed the unloader kicks off at around 145 psi but on the tank it says 125psi max. Could that be the problem that the compressor is working...