The McCormick 6689489A1 is a genuine OEM piston ring, also cross-referenced as Case IH and New Holland 87304191. This standard size piston ring is designed for various agricultural tractor engines, playing a critical role in maintaining engine compression and controlling oil consumption. Manufactured to original equipment specifications, it ensures a precise fit and long-lasting durability for reliable engine operation across compatible McCormick, Case IH, and New Holland models.