Genuine OEM Audi Coolant Hose With Regulator, part number 8W0122449M. This component is responsible for transporting engine coolant between various cooling system components while also regulating its flow. The integrated regulator helps maintain optimal engine operating temperatures. This hose measures approximately 0.215 meters in length. Choosing a genuine OEM coolant hose ensures the correct material composition for heat and pressure resistance, precise routing geometry, and reliable flow regulation for engine longevity.