This Dixon Valve FM1515F hex nipple fitting is a short length of pipe with threaded ends for connecting threaded pipes, and it has a hexagonal section in the middle for an increased bearing surface when adjusting the fitting with a wrench. It is made of brass for resistance to corrosion. This female-to-male hex nipple has a 1-1/2" female National Pipe Taper (NPT) threaded connection on one end and a 1-1/2" male National Standard Thread (NST) or National Hose (NH) connection on the other. This hex nipple fitting is suitable for use in general firefighting applications.

Tube fittings are components used for connecting, branching, terminating, and changing the direction of tubing in pneumatic and hydraulic systems. They are made of brass, stainless steel, PBT (polybutylene terephthalate), and other materials that resist corrosion and wear. Tube fittings have various types of connections, including threaded, welded, barbed, and push-to-connect (also called one-touch). Push-to-connect connections do not require tools or sealants. Tube fittings are used in various applications, including machine tools, airplane and truck controls, and automated production lines, among others.

Dixon Valve & Coupling Company manufactures pipe and hose fittings and accessories. The company, founded in 1916, is headquartered in Chestertown, MD.