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This PT Coupling hard coat aluminum cam and groove B-type reducer hose coupler is suitable for connecting two hoses of different sizes. B-type connections have a coupler at one end and a male National Pipe Thread (NPT) threaded connection at the other. It's made of hard coat aluminum for durability, lighter weight, and resistance to corrosion, making it compatible with sand and salt water applications, hydraulic oil, coolants, gasoline, and petroleum products. This cam and groove hose fitting joins hoses and pipes in a variety of applications in the construction, mining, agriculture, manufacturing, automotive, and petroleum industries, among others.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.PT Coupling manufactures pneumatic and hydraulic hose fittings for industrial and automotive applications. The company, founded in 1951 and headquartered in Enid, OK, meets International Organization for Standardization (ISO) standard 9001.