O-ring

Devilbiss Oil Free Pump Parts (Portable)

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Price: $4.59

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

Order this if ordering valve plate or a new head.