This Dixon 90DCS6025F cast brass double clapper siamese connection has two 2-1/2" female National Standard Thread (NST) inlets, a 6" female National Pipe Taper (NPT) straight back outlet, and double drop clappers with two pin lug swivel inlet couplers. Its brass construction provides corrosion resistance, ductility at high temperatures, and low magnetic permeability. It has a 175 pounds per square inch (psi) maximum working pressure at 70 degrees F and combines two 250 gallons per minute (gpm) water sources to create a 500 gpm flow. This double clapper siamese connection is suitable for use in fire equipment such as connected to a fire control standpipe outside a building.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.