This is a A-440-876 Pressure Relief Valve O-Ring PN: 440-876Main Description As Following : A-440-876 Pressure Relief Valve O-Ring P.N: 440-876 GM & Ford Clutch Cycling Pressure Switch O-Ring, York Oil Plug O-Ring Replaces: 012G AIR CONDITIONING , 440-263 AIR CONDITIONING , 440-862 AIR CONDITIONING Found in Section & Models : Air Conditioning Parts > Compressor/ Clutch Parts, (Miscellaneous) (UNDEFINED): SEVERAL Associated Items : New Also This is An Aftermarket Product And : GM & Ford Clutch Cycling Pressure Switch O-Ring, York Oil Plug O-Ring