This Vibrant 4 Ply Reinforced Silicone Transition Connector is a great solution for connecting two different sized pipes or hoses. It features a 2.5in inner diameter (I.D.) and a 3in outer diameter (O.D.) and is 3in long. It is made of durable 4 Ply reinforced silicone which makes it resistant to extreme temperatures, chemicals, and vibration. It also features a black finish for a sleek look. This transition connector is ideal for automotive, industrial, and marine applications.