Features precision-hardened ball-type check valve to provide superior sealing and lash control. Valve seal is self-cleaning, making it less susceptible to noise caused by oil contamination. Lifter body and roller are heat-treated for improved strength and wear resistance. Plunger is precision-ground and select-fitted to a tolerance in the millionths-of-an-inch for quieter operation. Made in the U.S.A..
