Genuine OEM Volkswagen Transmission Breather Valve, part number 0AA301047P. This small but vital component is located on the transmission or differential housing and is designed to allow air to enter and exit, equalizing internal pressure. This prevents pressure buildup that could damage seals and gaskets, ensuring proper lubrication and extending the lifespan of the transmission. As a genuine OEM part, it provides the exact venting characteristics and material integrity required for reliable long-term performance in demanding conditions.