The Eaton Fuller Cup Plug, part number GX8870278, is a genuine OEM component used in Eaton Fuller manual transmission assemblies. Cup plugs serve as precision press-fit seals within transmission housings and gear assemblies, preventing fluid migration and maintaining internal pressure integrity. This part is sold individually and is cataloged under Eaton’s manual transmission gear components. Pro Gear and Transmission carries genuine Eaton Fuller parts. Call us to confirm this is the correct plug for your specific transmission application.Interchanges:HFGX8870278FeaturesGenuine Eaton Fuller OEM part number GX8870278Cup plug for Eaton Fuller manual transmission assembliesFunctions as a press-fit seal within transmission housing or gear componentsSold as individual unit (each)Used in this Eaton Fuller modelFS-V8209A-RH