Genuine OEM Volkswagen Fuel Filter Check Valve, part number 1J0127247A. This valve is designed to prevent fuel from flowing backward through the fuel filter, maintaining correct fuel pressure and protecting the fuel system from potential damage. It is an inline component in the fuel delivery system. Measuring approximately 8.7 cm long, this lightweight valve weighs only 0.013 kg. Using a genuine OEM check valve ensures precise flow control and material compatibility, critical for the longevity and reliable performance of the entire fuel system.