Valve Plate Gasket
Devilbiss Pump Parts (125psi & 175psi)

Price: $36.71
Found under the following brands:
Annovi Reverberi-AR, Westward, Bostitch, Black & Decker, Craftsman, Devilbiss Air Power, DeWalt, Emglo, Excell, Porter Cable, Speedaire
Order this when replacing valves along w/ Head Gasket (part# 5140118-80).