Found under the following brands:
Master Tool Repair
Everything you need for a valvejob. Includes both valveplates, valves and related gaskets. Poor performance or air leaks out of the intake filter while the unit is running? This is probably the problem.
Air Compressor Pump Parts
Portable Oil-Bath Direct-Drive Air Compressor Parts
Wheeled Portable Oil-Bath Direct-Drive Electric Air Compressor