Help seal out contaminantsHelp retain fuel tank sending unitGM-recommended replacement part for your GM vehicleâ€TMs original factory componentOffering the quality, reliability, and durability of GM OEManufactured to GM OE specification for fit, form, and functionACDelco GM Original Equipment Fuel Tank Sending Unit Lock Rings are GM-recommended replacements for your vehicleâ€s original components. These rings help seal out contaminants, and help retain your vehicleâ€s fuel tank sending unit. These original equipment lock rings have been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.