The McCormick K911917 is a genuine fuel pump membrane, also known as a diaphragm, essential for the proper functioning of the fuel system. This OEM part ensures reliable fuel delivery and is compatible with a wide range of agricultural machinery including various David Brown, Landini, and Massey Ferguson tractor models, as well as Perkins engines. It features an outer diameter of 51 mm, an inner diameter of 10 mm, and a thickness of 1.5 mm, ensuring a precise fit and optimal performance.