Genuine OEM Audi Engine Coolant Hose, part number 4M0819337BK. This vital component is responsible for transporting engine coolant between various engine components, ensuring efficient heat dissipation and maintaining optimal operating temperatures. It is positioned within the engine cooling system, as shown connected to a valve in the assembly diagram. Weighing 0.422 kg, this hose is engineered for durability and resistance to high temperatures and pressures. Choosing genuine OEM ensures the correct routing geometry, material composition, and resistance to coolant chemicals, preventing leaks and maintaining cooling system integrity.