This special O-ring is sold in a 5-pack for Mack transmission applications, and it also fits Volvo. It is sized to seal a specific fitting or connection point against fluid or air leakage. The nonstandard sizing suits particular transmission connections rather than a generic seal application.Interchanges:Mack 22786249Mack 25633214Mack 561KC23GGA-2916OEMThis unit is sold in packs of 5.FeaturesSpecial O-RingSold as a 5-piece packTransmission product groupTech SpecsUnit of measure: 5-piece packUsed in these Mack modelsT2110B / T2110D TransmissionT309L / T310 TransmissionT310M Transmission