3-1/4 IN to 2-13/16 IN Reducer: This coupling features a 40 Degree angle and is designed to connect to tubes with a 3-1/4 IN and 2-13/16 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 a layer of polyester reinforcement, making it extremely durable and less prone to deformation, tearing, and other damage, than average couplings. The built-in 1/2 IN port hole allows for easy connection to a PCV line.Stainless Steel Clamps: Two corrosion-resistant stainless-steel worm clamps (#048 & #052) 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 05-01379.