Genuine OEM Volkswagen Upper Radiator Coolant Hose, part number 1K0122101JS. This essential hose is responsible for transporting engine coolant between the radiator and the engine, maintaining optimal operating temperatures. It is designed as the upper radiator hose and includes a quick-release coupling for secure and efficient connection. Manufactured from durable rubber, it is engineered to withstand high temperatures and pressures. Choosing a genuine OEM coolant hose ensures correct routing geometry, material composition for fluid resistance, and reliable, leak-free operation, preventing potential engine damage.