O-Ring Kit 1 - Push Rod Retainer 1 - Co2 Valve & Relief Valve 1 - Co2 Stem/End cap/ Reg. Valve 1 - Regulator Sealing O-Ring 1 - Co2 Housing O-Ring 1 -  Reg. Valve O-Ring 1 - Co2 Bushing O-Ring 1 - Relief Valve Body O-Ring 1 - Regulator End Screw O-Ring 1 - Regulator Spring Pad O-Ring 1 - Air Chamber OD O-Ring 1 - Air Chamber Cap O-Ring 1 - Barrel Nubbin 1 - Firing Bumper 1 - Co2 Seal