The high temperature injection molded silicone bellow coupler is designed to connect to a 3-3/4 OD tube and is 2-1/2 long. Standard stainless steel worm-gear #056 clamps provides tight connections, durability and is corrosion resistance for industrial, commercial, truck, off-road and racing applications. Product Features:Injection Molded High Temp SiliconeCoupler Hose Allows For Expansion/Movement/VibrationStainless Steel Worm-Gear Clamps Provides Tight ConnectionsWorm-Gear Clamps Provide Durability/Corrosion Resistant