CF vacuum flanges are all-metal sealing methods and are widely used in ultra-high vacuum systems. KF vacuum flanges are a quick-release method used in vacuum systems. ISO flanges, as the diameter of ISO general pipe is more than 50mm (2 inches), which can be used in various applications from atmospheric pressure to high vacuum, are often assembled and disassembled. more information and images at https://www.bowahvacuum.com