Universal Regulator: 4-port, two 1/4" FPT ports, and two 1/8" FPT ports (gauges sold separately here). The regulator controls the amount of air in your air compressor hose. Replace this if you're not able to adjust the PSI to your hose or if it leaks...

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...

Screw to fasten the handle to the compressor base.

Screw (fastener) for the motor/pump shroud.

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

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.