The McCormick 392867X1 is a genuine piston ring designed for various McCormick tractor models, including the B250, B275, B414, 434, and 444. This essential engine component helps maintain proper compression and oil control within the cylinder. With a bore diameter of 79.375 mm and a thickness of 2.36 mm, it ensures a precise fit and reliable operation, contributing to the longevity and efficiency of your agricultural machinery.