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.

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.