Found under the following brands:
A1 Coupling & Hose, Popular Brands, ProForce, Coleman Powermate Sanborn, Craftsman, Industrial Air, Kobalt, Morgan, Porter Cable, Task Force
Valveplate assembly (includes gaskets, items 10 & 12). Two valves are located in the head and two valves located in the valve plate (head not included). Poor performance or air leaks out of the intake filter while the unit is running? This is probably the problem.