Genuine OEM Volkswagen Fuel Non-Return Valve, part number 165201542B. This critical component is designed to prevent fuel from flowing backward within the fuel line, maintaining consistent fuel pressure and ensuring reliable engine starting. It is installed inline within the fuel system. This small, lightweight valve, weighing approximately 0.011 kg, is constructed from durable plastic. Opting for a genuine OEM fuel non-return valve guarantees precise flow characteristics and material compatibility with fuel, preventing leaks and ensuring the long-term reliability of the fuel delivery system.