This 3-1/2” long coupling is designed to connect to tubes with a 3-1/8” and 3” diameter. It’s commonly used on aFe POWER cold air intake systems, but can be used for a variety of projects. Its bellows design is extremely flexible, making it easy to install, even when dealing with misaligned tubes. It allows for ample expansion, movement and vibration in-between two hard pipes. Two corrosion-resistant stainless-steel worm clamps (#048) are included, providing a secure seal for virtually any application.