The jpgs are of a recent E-bay auction that I won.  I needed a portable, semi-disposable compressor for use on a part time residential renovation job site.  I was expecting a 1/3 or ½  hp motor and hoping for a 3/4 hp.  Instead I got a small & very heavy 
This is an old unit and there is no relay to turn the motor on & off.  When the compressor is plugged in, the motor is running.  When the compressor reaches the upper pressure limit, the compressor quits pumping (motor never stops running, compressor is a
There is a problem with the compressor operation:  there is either no check valve or it is non-functional when the compressor is not pumping.    Once the high limit pressure is reached and the compressor pump quits pumping the air in the tank bleeds out (