Genuine OEM Volkswagen Bearing Housing with Pump, part number 026121005H. This is the water pump assembly, identified as number 1 in the diagram, responsible for circulating coolant through the engine to prevent overheating. It includes the bearing housing and the pump wheel. Constructed from durable materials to withstand engine operating conditions. Genuine OEM water pumps are precisely balanced and sealed to ensure reliable, leak-free operation and optimal engine temperature management.