The Caterpillar 3179421 is an authentic OEM O-ring seal, specifically engineered to provide a reliable and leak-free seal in a wide range of Caterpillar machinery applications. This high-quality seal is crucial for preventing fluid loss and ensuring the optimal performance and longevity of hydraulic and other critical systems. It features an inner diameter of 22.225 mm, an outer diameter of 31.75 mm, and a thickness of 3.175 mm, making it a precise fit for its intended use.