The McCormick 3551803M1 is a genuine OEM piston ring designed for McCormick MC Series agricultural tractors, including models MC100, MC105, MC110, MC115, MC120, MC130, MC135, MC80, MC90, and MC95. This critical engine component ensures proper compression and oil control, vital for maintaining engine efficiency and longevity. Manufactured to McCormick's stringent specifications, this piston ring provides a precise fit and reliable performance.