The McCormick 4203637M1 is a genuine OEM fuel cap specifically engineered for McCormick agricultural tractors. This essential component ensures a secure seal for the fuel tank, preventing contamination and fuel loss. It is compatible with various models across the McCormick X4, X5, X6, X7, and X8 Series, providing a direct replacement for the original part. Trust this authentic McCormick fuel cap for reliable performance and proper fitment.