3-1/8 IN to 2-3/4 IN Reducer: This coupling features a 90 Degree angle and is designed to connect to tubes with a 3-1/8 and 2-3/4 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. The built-in port hole allows for easy connection to a PCV line.Stainless Steel Clamps: Two corrosion-resistant stainless-steel worm clamps (#044 & #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 05-01478.