Pipe end caps are exactly what they sound like. They are custom fittings that cover the ends of metal pipes.The central purpose of a pipe is to transport liquids, gases, and other materials for a wide variety of industries. Industrial pipes in particular are vulnerable to dust, debris, and many forms of damage, so pipe caps are designed to protect the pipe ends and keep the interior clean.A stainless steel butt weld cap is a type of pipe fitting that covers the end of a pipe. Since it can have female threads, it can screw on to the male end of the pipe. It can also be welded on to close the end of the pipe. On a weld, if it is a temporary close, or the contractor wants to add to the piping system in the future, he or she should allow additional pipe before closing so the pipe cap can be cut off and the pipe system extended as needed. This way you will not have less pipe than you need and the new fitting can be attached correctly.