Dayco 89221 Automatic Belt Tensioner Manufactured with a specially coated patented flat wire spring to allow the internal tension to be concentric, thus providing a more even degree of constant tension Contains a metallic locator pin built to withstand extreme drive demands and properly locate the tensioner for installation The heavy duty cast aluminum spring case resists cracking and fatigue This tensioner is another Dayco product proudly made in the USA Limited Three Year Warranty