Genuine OEM Audi Coolant Hose, part number 4L0121124B. This essential component transports coolant within the engine cooling system and features an integrated coolant regulator. The regulator precisely controls the flow of coolant, ensuring the engine reaches and maintains its optimal operating temperature. Weighing approximately 0.168 kg, this hose assembly is designed for specific routing and connection points. Choosing a genuine OEM coolant hose with an integrated regulator guarantees accurate temperature control and reliable performance, preventing engine overheating or inefficient operation.