Genuine OEM Volkswagen Coolant Thermostat, part number 075121113D. This essential component is responsible for regulating the flow of engine coolant, ensuring the engine reaches and maintains its optimal operating temperature for efficiency and performance. Weighing approximately 0.107 kg and measuring about 68mm in diameter, it is a precision-engineered part. Using a genuine OEM thermostat guarantees accurate temperature regulation and reliable operation, preventing engine overheating or undercooling that can lead to significant damage and reduced fuel economy.