Dutton-Lainson Grease Keeper Caps, 21841, 3/4 IN

Grease Keeper 3/4 IN wheel bearing protectors Zinc plated steel dust caps with grease zirk and pressure relief valve Protects wheel bearings from water and dirt with a positive hub seal Supplies a reserve of lubrication and has built-in positive relief Longer time between periodic repacking of bearings Protects and extends bearing life Zirk permits frequent greasing and relief valve eliminates excess pressure on grease seal No complicated moving parts or gaskets that require costly maintenance and replacements Easily installed in seconds no need to remove hubs A positive hub seal minimizes water entry when wheels are submerged Includes two protectors and two vinyl dust covers Made in the USA.