The McCormick 217829 is a genuine OEM piston ring designed for various McCormick D and TD series tractors. This critical engine component helps maintain proper compression within the cylinder, preventing gas leakage and ensuring efficient engine operation. With a bore diameter of 85 mm, a thickness of 2.5 mm, and a ring height of 3.5 mm, this piston ring is engineered to meet original equipment specifications for durability and performance. It is compatible with models such as D-212, D-214, D-217, D-219, D-320, D-322, D-324, D-326, D-430, D-432, D-436, D-439, D-440, D-450, and their TD counterparts.