This genuine McCormick part 3675113M91 is a duct designed for various agricultural machinery. It is compatible with McCormick X4 series tractors including models X4.35, X4.40, X4.45, X4.50, X4.55, X4.60, X4.70, and X4.80. Additionally, it fits Massey Ferguson 3600, 3700, and 4700 series tractors, specifically models such as 3625, 3635, 3645, 3650, 3655, 3660, 3670, 3680, 3707, 3708, 3709, 3710, 4707, 4708, 4709, 4710, 4710S, 4711, 4712, 4713, 4713S, 4714, 4715, 4716, and 4718. This duct ensures proper airflow and system functionality in compatible machinery.