Genuine OEM Audi Engine Coolant Hose, part number 4K0121070P. This critical component is responsible for carrying coolant between various parts of the engine cooling system, maintaining optimal engine operating temperature. Constructed from durable, heat-resistant rubber, it is designed to withstand high pressures and temperatures. Choosing a genuine OEM hose ensures the correct routing geometry, material composition, and connection integrity for reliable, leak-free coolant circulation.