Product Details: Keeping you Ready for the Road Ahead™, the Dayco 89448™ Gold Label® Heavy Duty Automatic Belt Tensioner is meticulously made to the strictest design specifications. This belt tensioner features a high-strength cast aluminum body designed to keep contamination out and resist cracking, fatigue, and deformation. In addition, the advanced material used reduces weight when compared to regular belt tensioners, while providing long-lasting strength and durability. The Dayco heavy duty belt tensioner features several patented components which are engineered to handle the higher torque and power pulses exerted by modern diesel engines. FleetPride is your First Click in Heavy Duty®.