Genuine OEM Audi Engine Coolant Pump Housing, part number 05A121037B. This housing forms the main body of the engine coolant pump assembly, providing the enclosure for the impeller and other internal components. It is a critical part of the engine cooling system, ensuring proper coolant flow and containment. Choosing a genuine OEM housing guarantees precise machining, correct sealing surfaces, and material integrity for reliable, leak-free operation and optimal engine temperature regulation.