The Cat 4K4879 O-Ring is a genuine Caterpillar component designed for reliable static and dynamic sealing in various Cat machines. Manufactured from NBR (70 durometer) material, this O-ring offers high resistance to abrasion, extrusion, oil-based fluids, water, and alcohol. It features an inner diameter of 104.49 mm and a cross-section of 3.53 mm, ensuring excellent sealing capabilities and a low compression set. Engineered to meet the exact specifications of your Cat equipment, it operates effectively within a temperature range of -40°C to 100°C.