The Case IH 9958566 is a genuine OEM O-Ring designed for critical sealing applications in various Case IH agricultural and construction machinery. This O-ring features an inner diameter of 17.17 mm and a thickness of 1.78 mm, providing a reliable, leak-free seal in hydraulic, engine, and transmission systems. Manufactured to precise specifications, it ensures optimal performance and durability for a wide range of Case IH tractors, combines, balers, and other equipment.