The McCormick 3540326M91 is a genuine OEM fuel tank cap designed for various McCormick tractor models, including the CX, MC, MTX, XTX, and ZTX series. This essential component ensures a secure seal for the fuel tank, preventing fuel spillage and contamination, and maintaining the integrity of the fuel system. Manufactured to McCormick's specifications, it guarantees proper fit and reliable performance for your agricultural machinery.