The high temperature 1-Ply reinforced silicone straight coupler is designed to connect a 3 in. OD tube to a 2-1/2 in. OD tube and is 3 in. long. Standard stainless steel worm-gear #044 & #048 clamps provide tight connections, durability, and are corrosion resistant for industrial, commercial, truck, off-road, and racing applications. Note Not for use on pressurized side of supercharged or turbocharged applications.