This genuine McCormick 6501374M1 fitting is an authentic OEM replacement part designed for various McCormick X4 series tractors, including models such as X4.35M, X4.40M, X4.40F, X4.40V, X4.45M, X4.45F, X4.45V, X4.50M, X4.50F, X4.50V, X4.55M, X4.55F, and X4.55V. It is also compatible with certain Landini 4-series tractors like 4-070, 4-075, 4-080, 4-090, 4-100, and 4-105. This fitting ensures proper connection within the hydraulic or fluid systems of compatible agricultural machinery.