Genuine OEM Volkswagen Thermostat Housing, part number 07K121115D. This housing encloses the engine thermostat and plays a vital role in directing the flow of coolant through the engine's cooling system. It is typically mounted to the engine block or cylinder head. Constructed from durable, heat-resistant plastic, this part weighs 0.442 kg. Choosing a genuine OEM thermostat housing ensures proper sealing, correct coolant routing, and resistance to thermal cycling and chemical degradation.