Genuine OEM Ford Crankcase Vent Hose, part number 4461858. This hose routes crankcase gases from the engine's crankcase to the intake system for re-combustion. It plays a crucial role in emissions control by preventing the release of harmful vapors. The part is made of durable rubber to withstand engine bay temperatures and oil vapors. Genuine Ford parts are manufactured to exact specifications for proper fit and function.