Old Part Numbers: SSF-3158-1This is the screw that holds down the piston cover, on the top of the piston.

Air compressor check valve. 3/8" Comp x 1/2" MPT with 1/8" FPT side port.  The check valve is a one-way valve that prevents air from back-feeding from the air tank. If your unit has a hard time restarting when trying to cycle or your pressure switch...

Order this if ordering valve plate or a new head.

Screw (fastener) for the motor/pump shroud.

Old Part Numbers: D24888, D30198, 5135135-00Pipe Nipple, 1/4" male NPT x 1/4" long. Don't forget to apply Teflon Tape to the threads to seal it.

Screw to bolt the fan to the motor, .250-20 x .750 U.