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...

Screw to fasten the handle to the compressor base.

Old Part Numbers: SSW-7367Strain relief for air compressor power cord going into the pressure switch housing.

Screw (fastener) for the motor/pump shroud.

Old Part Numbers: AC-0385, D21299, Z-D21299(4 PORT) 100/125 PSI If your valve is leaking on the side of the switch, do not order this part. Order check valve instead. 

Screw that fastens the front and back of the belt  guard to each other, and to the compressor base. THD FORMING

Old Part Numbers: AB-ACG18Saddle mount cup for the motor/pump feet. This installs on the mounting feet of the motor/pump assembly and keeps it from vibrating, as well as reducing noise.