The McCormick 6669711A1 is a genuine OEM piston ring designed for various McCormick CX, MC, and MTX series agricultural tractors. This essential engine component plays a critical role in maintaining proper cylinder compression and managing oil film on the cylinder walls, which is vital for engine efficiency, performance, and longevity. Confirmed fitment includes a wide range of models such as CX100, CX105, CX110, CX90, CX95, MC100, MC105, MC115, MC120, MC135, MC80, MC90, MTX110, MTX120, MTX135, MTX140, MTX150, MTX155, MTX165, MTX175, MTX185, and MTX200.