Genuine OEM Volkswagen Coolant Hose, part number 1K0121086R. This essential hose is responsible for transporting coolant throughout the engine cooling system, playing a critical role in regulating engine temperature and preventing overheating. Its complex, branched design ensures precise routing within the engine bay. Made from durable, heat-resistant rubber, it weighs approximately 0.255 kg. Installing a genuine OEM coolant hose ensures correct routing geometry, material composition, and resistance to temperature and pressure fluctuations, preventing leaks and ensuring the longevity of the cooling system.