This Vibrant 4 Ply Reinforced Silicone Transition Connector is a great choice for connecting two pipes of different sizes. It is 2.25 inches in inner diameter (I.D.), 3 inches in outer diameter (I.D.), and 3 inches long. It is constructed with four layers of reinforced silicone for extra strength and durability. This connector is black in color and is designed to resist extreme temperatures and vibrations. It is ideal for automotive, industrial, and marine applications.