Genuine OEM Jaguar Belt Tensioner Pulley, part number C2D21152. This pulley maintains optimal tension on the engine's accessory drive belt, ensuring efficient operation of components like the alternator and power steering pump. It is a critical component in the belt drive system. Weighing approximately 0.175 kg, this genuine OEM pulley is manufactured to precise factory tolerances for smooth, quiet, and reliable long-term performance.