Genuine OEM Volkswagen Additional Coolant Pump, part number 7E0121079AJ. This pump is designed to circulate coolant within an auxiliary cooling circuit, providing additional cooling capacity for specific engine components or systems. Weighing 0.1814 kg, it is a compact electric pump. Using a genuine OEM coolant pump ensures correct flow rates, electrical compatibility, and durable construction, which is critical for preventing overheating and maintaining the engine's thermal stability.