A barrel pipe nipple is a type of pipe fitting used to connect two lengths of pipe or a pipe to a fitting. It consists of a short piece of pipe with male threads at both ends. The term “barrel” refers to the cylindrical shape of the nipple, and “pipe nipple” indicates its function as a connector in a piping system.

These fittings are commonly made of materials like stainless steel, brass, or galvanized steel, and they come in various sizes to accommodate different pipe diameters and thread types. Barrel pipe nipples are often used in plumbing, HVAC systems, and industrial piping applications.