Product Details: The Dayco 89477™ Gold Label® Heavy Duty Automatic Belt Tensioner ensures you are Ready for the Road Ahead™ being meticulously engineered 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 helps reduce weight when compared to regular belt tensioners, while also 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®.