A pipe cap is a type of fitting used in plumbing or piping systems to seal the end of a pipe. It’s essentially a plug that fits over the end of a pipe, closing it off completely. Pipe caps come in various materials such as metal, plastic, or rubber, and they can be threaded, welded, or glued onto the pipe end, depending on the type of connection used in the piping system. They are commonly used in applications where the end of a pipe needs to be sealed temporarily or permanently to prevent leakage or contamination.