The Cat 3783178 Duo-Cone Seal is an OEM cast iron sealing component designed for demanding applications in Caterpillar articulated trucks, excavators, dozers, loaders, and more. It features a self-aligning and self-adjusting design, providing a long-lasting, leak-free seal with an inside diameter of 190.5 mm, an outside diameter of 215.9 mm, and a thickness of 25.4 mm.