I have a problem with my air compressor, I-R 2475, leaking air out of a bleed hole on the pressure switch. When running the leak stops and when it reaches the correct pressure it turns off and starts leaking. When I unplug it and the pressure goes low enough for the compressor to turn on the switch opens (or closes) the leak almost stops. I am not sure where the check valve is. I have attached 3 pictures. In picture 3 I circled big fitting that screws into the tank. Is the check vale underneath this fitting inside of the tank? The local parts dealer wants almost $60 for a replacement valve and I found an Ebay dealer that sells the same part for less than $20.
Any help or advise would be great,