Genuine OEM Audi Engine Coolant Hose, part number 4M0819674J. This hose is a vital component in the engine cooling system, responsible for transporting coolant to maintain optimal engine operating temperatures. It is a durable rubber hose, measuring approximately 11.2 cm long. Using a genuine OEM coolant hose ensures resistance to high temperatures and pressures, precise routing, and a leak-free connection, which is critical for preventing engine overheating and damage.