The McCormick 3657085M1 is a genuine OEM fuel tank cap designed for a wide range of McCormick X-series tractors, including X4, X5, X6, X7, and X8 models. This essential component ensures a secure and sealed fuel tank, preventing contamination and fuel loss. It is also cross-compatible with various Landini and Valpadana tractor models, serving as a direct replacement for OEM part numbers 3657085M1 from Landini and Valpadana. Weighing approximately 0.12 kg, this cap provides a reliable fit.