The McCormick 3648889M91 is a genuine OEM flexible air duct designed for various McCormick X-series tractors. This essential component ensures proper airflow within the engine system, maintaining optimal performance and preventing overheating. It is compatible with McCormick X4.20, X4.30, X4.40, X4.50, X4.60, X4.70, X5.20, X5.30, X5.40, X5.50, X6.420, X6.430, X6.440, X7.440, X7.450, X7.460, X7.650, X7.660, X7.670, X7.680, X7.690, X8.660, X8.670, and X8.680 tractor models. Measuring 300 mm in length with a 70 mm diameter and weighing 0.12 kg, this duct is a direct replacement for the original part.