The McCormick 3813861M1 is a genuine OEM sealing ring designed for various McCormick CX series tractors. This precision-engineered ring, with an inner diameter of 101.6 mm, an outer diameter of 108 mm, and a thickness of 3.2 mm, plays a critical role in maintaining proper sealing within the engine's piston and connecting rod assembly, preventing leaks and ensuring efficient operation. It is a direct replacement part for models including CX50, CX60, CX70, CX75, CX80, CX85, CX90, CX95, CX100, CX105, CX110, and CX110LP.