The 'NYLON RETURN LINE 4x2MM Citroen DS' is a high-quality nylon hose specifically designed for the fuel return flow in iconic Citroën DS models. With an outer diameter of 4 mm and an inner diameter of 2 mm, this line provides excellent resistance to fuel and wear. The flexible nylon material ensures easy installation and optimal fit within the fuel system of the Citroën DS. Whether you are restoring or maintaining your vehicle, this return line guarantees the safety and efficiency of the fuel supply.