Genuine OEM Audi Coolant Pipe, part number 057121073B. This flexible hose is a critical component in the engine cooling system, responsible for transporting coolant between various engine components to maintain optimal operating temperatures. It is located within the upper cooling circuit. Weighing approximately 0.3125 kg, this component is engineered for durability and flexibility. Choosing a genuine OEM pipe ensures correct routing geometry, material integrity, and resistance to thermal cycling and pressure fluctuations for reliable, leak-free operation.