This Dixon SM25F15T brass swivel suction adapter has a 2-1/2" female National Standard Thread (NST) on one end, a 3" male National Pipe Taper (NPT) thread on the other. The swivel connection reduces stress on fire hose when connecting and its pin lugs allow the connection to be tightened using fire equipment tools. The swivel adapter's brass construction provides corrosion resistance, ductility at high temperatures, and low magnetic permeability.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.