Genuine OEM Audi Engine Crankcase Vent Hose, part number 030103474Q. This shaped hose routes gases from the engine crankcase, playing a crucial role in emissions control and maintaining engine health. Weighing 0.105 kg and measuring 0.265 m in length, it is designed for precise fitment and resistance to oil and heat. Genuine OEM vent hoses ensure proper crankcase ventilation, preventing oil leaks, sludge buildup, and maintaining optimal engine performance.