This Dixon AST Series King combination nipple hose fitting is made of aluminum and connects hose to NPT male connection. This King combination nipple has a barbed end to create a tight seal on a hose when used with a hose clamp or crimp sleeve or ferrule (not included) and National Pipe Taper (NPT) male threads on the other to connect to NPT female connections. It is made of aluminum for lighter weight and resistance to corrosion and tarnishing and is not recommended for steam applications.Hose fittings connect, control, change the direction of, and terminate the flow in piping and hose systems. They are made of brass, stainless steel, galvanized steel, and other materials that resist corrosion, pressure, and wear. Hose fittings have various types of connections, including threaded, barbed, push-to-connect, dry disconnect, and others including those based on internationally-accepted specifications. Hose fittings are used in systems such as air compressors, automatic manufacturing operations, aircraft controls, and tire installation in industries including agriculture, mining, road construction, firefighting, and aviation.Dixon Valve & Coupling Company manufactures pipe and hose fittings and accessories. The company, founded in 1916, is headquartered in Chestertown, MD.