Genuine OEM Volkswagen Engine Coolant Thermostat Housing, part number 022121121D. This component provides the enclosure for the engine's thermostat and facilitates the routing of coolant through the cooling system. It is typically mounted on the engine block or cylinder head. Constructed from durable plastic, it weighs approximately 0.098 kg. A genuine OEM housing ensures proper fitment and leak-free operation, critical for maintaining engine cooling system integrity.