This is a A-RE62128 Kit, A/C Retrofit (R134A) PN: RE62128Main Description As Following : A-RE62128 Kit, A/C Retrofit (R134A) P.N: RE62128 R134A Found in Section & Models : Air Conditioning Parts > Conversion Kit, John Deere TRACTOR: 4050 (S/N <006509), John Deere TRACTOR: 4055, John Deere TRACTOR: 4250, John Deere TRACTOR: 4255, John Deere TRACTOR: 4450, John Deere TRACTOR: 4455 Associated Items : New Also This is An Aftermarket Product And : R134A