This genuine McCormick 4204623M91 DUCT is an original equipment manufacturer (OEM) part designed for optimal air circulation within McCormick X4.20, X4.30, X4.40, X4.50, X5.35, X5.45, X5.55 series tractors. It also fits Landini 4-060, 4-070, 4-080, 4-090, 5-085, 5-095, 5-105, and 5-115 tractors. Manufactured to precise specifications, this air duct ensures proper airflow and system functionality, contributing to the longevity and efficiency of your agricultural machinery.