Genuine OEM Audi Engine Crankcase Breather Hose, part number 03H103202D. This hose is a crucial part of the engine's positive crankcase ventilation (PCV) system, allowing harmful blow-by gases to be vented from the crankcase. It prevents pressure buildup and routes these gases back into the intake for re-combustion, reducing emissions. Weighing 0.0655 kg and measuring 0.19m x 0.065m x 0.06m, this hose is designed for specific routing and temperature resistance. A genuine OEM breather hose ensures proper fitment, flexibility, and resistance to oil and heat, preventing vacuum leaks and maintaining engine efficiency.