O-ring
Devilbiss Oil Free Pump Parts (Portable)

Price: $8.10
Found under the following brands:
Annovi Reverberi-AR, Westward, Bostitch, Black & Decker, Craftsman, Devilbiss Air Power, DeWalt, Emglo, Excell, Porter Cable, Speedaire
This part is available in the following kits
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Cylinder Ring & O-Ring Kit
Price: $28.38
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HP Piston Ring Kit
Price: $0.00
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Connecting Rod Kit
Price: $0.00
O-ring for valve plate. Used with original style valve plate.