The high temperature red 1-Ply reinforced silicone hump coupler is designed to connect to a (3-1/2″ x 3-3/4″)OD tube and is 3″ long. Standard stainless steel worm-gear #056 & #060 clamps provides tight connections, durability, and is corrosion resistant for industrial, commercial, truck, off-road, and racing applications.