2HP Cylinder O-Ring Head Rubber Gasket. Note: For newer models with motor serial# ending in "-OT".

Also known as a "cold start" valve, this integral component releases air off of the piston and pump head after it shuts off, which allows the motor to start much more easily and efficiently. This also reduces overheating issues. 

California Air Tools Cylinder O-Ring gasket. Note: For newer models with motor serial# ending in "-O".

NOTE! For newer models with motor serial# ending in "-O".  2 HP Pressure Plate