Product Details: The Dayco 89930™ Heavy Duty Automatic Belt Tensioner ensures you Ready for the Road Ahead™ being meticulously made to the most stringent design specifications. This belt tensioner boasts a high-strength cast aluminum body designed to keep contamination out and resist cracking, fatigue, and deformation. In addition, the advanced material used serves to 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 today’s diesel engines. FleetPride is your First Click in Heavy Duty®.