Vibrant 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 malefemale 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 - Ring and work well under operating conditions involving stress, vibration and temperatures that do not exceed 350deg F. They are available in diameters that support O.D. tubing ranging from 2 to 4.