Genuine OEM Volkswagen Coolant Hose, part number 3QF121109D. This hose connects various engine components to facilitate the flow of coolant, playing a vital role in temperature regulation. Its function is to ensure the continuous circulation of coolant throughout the engine to prevent overheating. This part is located at position 17 in the cooling system diagram. With a weight of 0.15 kg, this hose is designed for precise fitment and durability. Genuine OEM hoses are constructed from materials that resist heat and pressure, ensuring a reliable and leak-free connection within the cooling system.