Genuine OEM Audi Upper Breather Line, part number 0P2103210D. This critical component is part of the engine's ventilation system, responsible for managing crankcase pressure and ensuring efficient gas circulation. It is positioned as an upper line within the engine bay, connecting various components of the crankcase ventilation system. Weighing approximately 0.102 kg and measuring 0.294 m in length, this line is engineered for exact fitment. Opting for a genuine OEM breather line guarantees the correct hose material, resistance to engine fluids and temperatures, and precise routing to maintain optimal engine performance and emissions compliance.