Genuine VW/Audi Crankcase Vent Valve 06A133528D is an OEM replacement valve for the Volkswagen and Audi models. It is designed to replace the original valve and is made from high-quality materials for long-lasting reliability. The valve helps to regulate the pressure in the crankcase and keep it at optimal levels for efficient engine performance. It is an important component of the vehicle's engine and should be replaced regularly to ensure proper functioning.