There are Pipe Nipples offered by us that are the length of straight pipe with male threads on both ends. It is one of the most popular category of pipe fittings. It is a connector or a coupling threaded on both ends. In its most basic form, a nipple is a short length of pipe with male pipe threads at both ends for connecting other fittings. When it comes to plumbing and piping, a nipple is a fitting that is a short piece of pipe. The Pipe Nipples are usually provided with a male pipe thread (MPT) connection at each end of the fitting.