The high temperature 1-Ply reinforced silicone elbow coupler is designed to connect a 3-1/2 in. OD tube to a 3-3/4 in.) OD tube. Also, a molded 1/8 in. ID x 1/2 in. H port is located on one side of the coupler. 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. NOTE: Not for use on pressurized side of supercharged or turbocharged applications.