Genuine OEM Volkswagen Crankcase Breather Hose, part number 05E103474A. This flexible, corrugated hose is a vital component of the engine's ventilation system, responsible for routing crankcase gases from the engine to the turbocharger assembly. It ensures proper pressure regulation within the engine and contributes to emissions control by recirculating unburnt hydrocarbons. Positioned between the engine and turbo, it is designed to withstand oil vapour and temperature fluctuations. Weighing 0.07 kg, this hose maintains critical engine functions. Using a genuine OEM hose ensures correct material composition for resistance to oil and heat, preventing cracks and leaks that can lead to engine performance issues and increased emissions.