Automatic belt tensioners, provide the proper tension all belts require in a power transmission system of  a vehicle.The automatic belt tensioner also provides a little “give”; so it can absorb and cushion shock loads.Gates is a global leader in Original Equipment System Design, its DriveAlign® Automatic Belt Tensioners are OE-quality in durability, fit, and performance manufactured to rigid tolerances and specifications.Patented labyrinth seal protects internal components to meet or exceed OE life expectancy requirements.