The Chelsea 550437 is a Bearing Cone used in the 721 Series Power Takeoff. Per the Chelsea illustrated parts list for the PTO-721 Series, this bearing cone is installed in a quantity of two per assembly, meaning it is common to replace them as a pair. Chelsea PTO components are precision-manufactured to maintain the load-handling demands of heavy-duty power takeoff applications. Pro Gear and Transmission carries genuine Chelsea PTO parts for fleet and shop buyers. Call us to confirm proper fit for your application.FeaturesGenuine Chelsea Bearing Cone, part number 550437Designed for the Chelsea 721 Series Power TakeoffInstalled in a quantity of two per PTO assemblyDirect factory replacement per Chelsea PTO-721 Series illustrated parts listSold by Pro Gear and TransmissionUsed in this Chelsea PTO model721 Series