The Eaton Fuller O Ring, part number X8880639, is a genuine Eaton Fuller manual transmission component. O rings at the transmission level are sealing elements that prevent fluid migration between mating surfaces and housings, keeping the unit operating correctly. This part is sold individually and sourced directly through Pro Gear and Transmission. If you need help verifying this is the correct o ring for your transmission, give us a call before ordering.Interchanges:HFX8880639FeaturesGenuine Eaton Fuller part number X8880639Manual transmission sealing componentSold as individual unit (each)Fits Eaton Fuller manual transmission applications, call to confirm specific fitmentUsed in this Eaton Fuller modelFS-V8209A-RH