The Cummins 310402800 is a genuine OEM belt tensioner designed for water pump systems in various Cummins engines. This critical component maintains proper tension on the engine belt, preventing slippage and ensuring efficient operation of the water pump and other belt-driven accessories. Constructed for durability and reliable performance, it helps extend belt life and reduce maintenance needs. This part is essential for maintaining the integrity and efficiency of the engine's cooling and accessory drive systems.