Gassing Exhaust Valve for air compressors. If you have a loss of compression, replace this exhaust valve and the intake valve.

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. 

Rubber O-Ring Gasket for the cylinder head. Replace this gasket if you have to remove the cylinder head.

Electromagnetism Valve for 110V units.