Genuine OEM Audi Engine Coolant Hose, part number 4M0819373AK. This small, curved hose is a component of the engine cooling and heating system, responsible for circulating coolant to maintain optimal engine operating temperatures. Weighing 0.0379 kg, this genuine OEM hose is manufactured to precise specifications, ensuring correct routing geometry, material resistance to coolant chemicals, and long-term durability under engine heat and pressure, preventing leaks and system failures.