Vibrant AL V-B Flange Assembly for 4in OD Tubing incl 2 AL V-b flanges 1 SS V-B Clamp 1 Viton O-RingVibrant Performance v band flanges are constructed entirely from a 300 series stainless steel clamp that features a unique quick release clamping mechanism, and a unique male female 6061 aluminum flange design to ensure proper alignment inside the clamp. Vibrant Performance aluminum v band flanges are an excellent alternative to traditional *under the hood* silicone coupler connections, offers a solid, leak free connection with a built in FKM rubber O