Sierra 18-9851 Oil Seal Driver The Sierra 18-9851 Oil Seal Driver is used to install oil seals in TR and Bravo One and Two drive units bearing carrier. Interchangeable with Mercury Marine 91-55916 Special Order Item California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Google Product Type SPECIALORDER Wiser Yes Product MPN 18-9851 Product UPC 808282109592