The high temperature 1-PLY reinforced silicone reducer coupler is designed to connect to a (3-1/2 x 3) ID tube and is 2-1/2 long. Standard stainless steel worm-gear #048 and #056 clamps provides tight connections, durability and is corrosion resistance for industrial, commercial, truck, off-road and racing applications. Product Features:Reinforced High Temp SiliconeCoupler Allows For Expansion/Movement/VibrationCorrosion Resistant