Product Details Fangrui Product Details [1/2 Air Hose Fittings]this Chicago Fittings Is Designed For Use With 1/2 Inch Nominal Pipe Threads (npt) For Standard Air Hose Sizes. Note: Npt Thread Is A Nominal Pipe Size And Does Not The Actual Diameter. [1/2 Air Hose Fittings]the 1/2-inch Air Hose Fitting Can Be Used In A Variety Of Different Applications, Such As The Connection Of Oil Tubing, Steam Pipes, Water Pipes And Mechanical Pipes, But Also In Pneumatic Equipment, The Automotive Industry, Air Compressors, Mechanical Engineering, Can Be Quickly Switched Between Many Different Pneumatic Tools And Accessories. [1/2 Lug Universal Coupling]to Prevent The Coupling From Falling Off For A Certain Amount Of Time Under A Certain Amount Of Pressure, Resulting In Leaks And Other Problems, Each 1/2 Chicago Air Fitting Is Equipped With A Safety Lock And Rubber Gasket That Can Be Inserted Into The Couplings Keyhole. [high-quality]the Chicago Air Fittings 1/2 Is Made Of High Quality Carbon Steel Material, Galvanized , , . It Is Recommended That The Maximum