Dayco 89370 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 The patented Deflected Arm Plate dampens arm movement, prolonging the life of the tensioner by limiting the amount of rotational movement Contains a metallic locator pin built to withstand extreme drive demands and properly locate the tensioner for installation Dayco's patented Nylon Pivot Bushing keeps internal components in constant contact to maintain proper tensioner alignment Limited Three Year Warranty