This is a A-T103182 O-Ring PN: T103182Main Description As Following : A-T103182 O-Ring P.N: T103182 Q.Cplr Socket to Return Line Stocked As: A-023N Found in Section & Models : Air Conditioning Parts > Lines/ Hoses, Case-IH TRACTOR: MX100, Case-IH TRACTOR: MX110, Case-IH TRACTOR: MX120, Case-IH TRACTOR: MX135, Case-IH TRACTOR: 5120 (S/N