Genuine OEM Audi Water Pump, part number 03C121004J. This critical component is responsible for circulating coolant throughout the engine's cooling system, preventing overheating and ensuring stable operating temperatures. It is an integral part of the engine cooling assembly. Weighing approximately 2.8 kg, this pump is built to precise factory specifications. Opting for a genuine OEM water pump guarantees correct flow rates, reliable performance, and durability, preventing costly engine damage from improper cooling.