A swage pipe nipple is a short piece of pipe with male threads at both ends. It’s used to connect two female-threaded fittings or pipes of different sizes. One end of the swage nipple is larger in diameter, while the other end is smaller. This allows for a transition between two different pipe sizes within a plumbing or piping system. Swage nipples are commonly used in industries such as oil and gas, petrochemical, and plumbing for various applications including reducing pipe sizes, extending pipe lengths, or connecting different types of pipes or fittings.