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...

Head O-ring Gasket. This is the o-ring on top of the valve plate, directly underneath the head. Order this if ordering valve plate or a new head.

Screw to fasten the handle to the compressor base.

Screw (fastener) for the motor/pump shroud.

Isolator for pump base. Keep your compressor from damage by replacing these isolators if missing or damaged.

Muffler for Single Cylinder units.

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