3-1/2 IN Internal Diameter: This 2-1/4 IN long coupling is designed to connect to a tube with a 3-1/2 IN diameter. It's commonly used on aFe POWER cold air intake systems, but can be used for a variety of projects.Silicone Construction: Its silicone construction features two layers of polyester reinforcement, making it extremely durable and less prone to deformation, tearing, and other damage, than average couplings.Stainless Steel Clamp: Two corrosion-resistant stainless-steel worm clamps (#056) are included, providing a secure seal for virtually any application.Fitment Note: Not for use on pressurized side of supercharged or turbocharged applications. Direct Replacement for P/N 05-01322.