Genuine OEM Audi Ventilation Hose, part number 05A103223B. This hose is a critical component of the engine's crankcase ventilation system, designed to reroute blow-by gases back into the intake system for re-combustion. It is located in the engine bay, connecting various ventilation components. Constructed from durable, oil-resistant rubber to withstand engine conditions. Genuine OEM ventilation hoses are manufactured to precise specifications for correct flow and durability, ensuring proper engine function and emissions control.