The McCormick 3559891M1 is a genuine spark plug designed for optimal performance in various agricultural machines, including models from Massey Ferguson, McCormick, Landini, Valmet, and Valtra. This spark plug features a 14mm thread size, 19mm reach, and a 21mm hex size, ensuring a precise fit and reliable ignition. It has a heat range of 5, a gasket seat type, and a projected tip, with a gap of 0.035 inches (0.889 mm). It is a non-resistor type spark plug, suitable for a wide range of applications.