Product Details: The Kit Masters Engine Cooling Fan Clutch ensures you are Ready for the Road Ahead™ featuring Auto Lock, a patented fail-safe innovation that automatically locks fan clutches, allowing you to finish your trip, when the friction material nears the end of life. Boasting of two O-rings, creating a superior air barrier while providing motion resilience. Made to outperform and outlast the competition, this heavy duty fan clutch boasts unparalleled dual seal performance. You must replace pulley bearings when rebuilding your fan clutch to maintain your product warranty. FleetPride is your First Click in Heavy Duty®.