Genuine OEM Audi Engine Coolant Hose, part number 057121637A. This hose is a vital component of the engine cooling system, responsible for transporting coolant to maintain optimal engine operating temperatures. It is integrated within the complex network of cooling lines. Weighing 0.0215 kg, this hose is designed for durability and resistance to high temperatures and pressures. Using a genuine OEM hose ensures correct material composition, routing geometry, and resistance to coolant chemicals, preventing leaks and maintaining cooling system efficiency.