The McCormick 6514159M91 is a genuine OEM fuel tank cap designed for various McCormick tractor models, including the C, CX, MC, MTX, XTX, and ZTX series. This essential component ensures a secure seal for the fuel tank, preventing contaminants and fuel spillage. It is also cross-referenced with Massey Ferguson part numbers 3614270M91, 3614270M92, 3614270M93, 3614270M94, and 3614270M95, indicating broad compatibility within AGCO-related machinery.