A fuel line non-return valve for Citroën 2CV, DS and HY prevents fuel from flowing back into the line. This ensures a constant fuel supply to the engine, which is essential for optimal performance and efficient fuel consumption. The valve is easy to install and made from high-quality materials to ensure durability and reliability. It is specifically designed to fit perfectly on these classic car models, contributing to a smooth driving experience. This small but crucial component protects the fuel pump and engine from potential damage caused by backflowing fuel.