This genuine McCormick 4220770M2 Fuel Tank Cap is an original equipment manufacturer (OEM) replacement part designed for various McCormick tractor models. It features an outer diameter of 70 mm and an inner diameter of 40 mm, ensuring a secure seal for the fuel tank. This cap helps prevent fuel spillage and contamination, maintaining the integrity of the fuel system. It is confirmed to fit a wide range of McCormick CX, MC, MTX, XTX, and ZTX series tractors.