Genuine OEM Audi Coolant Hose, part number 4E0121051B. This flexible hose is designed to transport engine coolant between various components of the cooling system, such as the radiator and auxiliary coolers. It plays a crucial role in regulating engine temperature, preventing both overheating and overcooling. Weighing 0.1395 kg and measuring 0.31m in length, this genuine OEM coolant hose is engineered with specific bends and material compounds to withstand high temperatures and pressures, ensuring leak-free performance and proper coolant flow for efficient engine cooling.