This Dixon HU series hammer union coupling is made of forged steel and connects two male NPT threaded connections in a straight run. It has two female National Pipe Taper (NPT) threaded ends to connect with male NPT connections to create a tighter seal on a hose than straight threads with a maximum working pressure of 2,000 pounds per square inch (psi) of non-shock cold working pressure (NSCWP) in a temperature range of -25 to +200 degrees F. This fitting is made of forged steel for better weldability and increased rust resistance than wrought iron and greater strength than unforged steel. It is for use with Dixon Series 200 components only. This hammer union is used in general service applications running air, water, oil, or gas.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.