The Eaton Fuller Cup Plug, part number X8873669, is a genuine Eaton Fuller manual transmission component designed to seal internal passages within the gearbox. Cup plugs serve a critical sealing function inside the transmission case, preventing fluid migration between bores or passages. This part is categorized under manual transmission components and is sold individually. Pro Gear and Transmission carries genuine Eaton Fuller parts for heavy-duty drivetrain applications. Not sure this is the right plug for your transmission? Give us a call to confirm proper fit before ordering.Interchanges:HFX8873669FeaturesGenuine Eaton Fuller part number X8873669Manual transmission cup plug for internal bore sealingSold as an individual unitCompatible with Eaton Fuller manual transmission assemblies