The McCormick 6624959A1 Duct is a genuine OEM replacement part designed for various McCormick X4 and X5 series tractors, including models X4.20, X4.30, X4.40, X4.50, X4.60, X4.70, X4.70F, X4.70V, X4.80, X4.80F, X4.80V, X4.90, X4.90F, X4.90V, X5.20, X5.30, X5.40, X5.50, X5.60, X5.70, X5.80, and X5.90. This essential component ensures proper airflow within the tractor's systems, maintaining optimal performance and preventing issues related to ventilation. Trust in genuine McCormick parts for reliable fit and durability.