This 2-1/2” long coupling is designed to connect to a tube with a 2-1/2” diameter. It’s commonly used on aFe POWER cold air intake systems, but can be used for a variety of projects. 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 port hole allows for easy connection to a PCV line. Two corrosion-resistant stainless-steel worm clamps are included, providing a secure seal for virtually any application.