This Tru-Flate 13-755 push-to-connect air line coupler connects a supply line hose to a plug, tool, or other air operated machinery. It is made of brass for resistance to corrosion and has a 1/4" female National Pipe Thread (NPT) threaded connection for connecting to a male hose fitting. This Industrial/Milton (M-style) push coupler interchanges with a wide variety of plugs or tools, and has a sleeve guard to protect from accidental disconnection. It has a maximum working pressure of 300 pounds per square inch (psi). This push coupler is interchangeable with American National Standards Institute (ANSI) and National Fire Protection Association (NFPA) T3.20.14-1990 dimensions, and it is suitable for use with compressed air lines.Tube fittings are components used for connecting, branching, terminating, and changing the direction of tubing in pneumatic and hydraulic systems. They are made of brass, stainless steel, PBT (polybutylene terephthalate), and other materials that resist corrosion and wear. Tube fittings have various types of connections, including threaded, welded, barbed, and push-to-connect (also called one-touch). Push-to-connect connections do not require tools or sealants. Tube fittings are used in various applications, including machine tools, airplane and truck controls, and automated production lines, among others.Plews & Edelmann manufactures automotive and pneumatic hose, lines, reels, accessories, fittings, and lubricants under the Edelmann, Amflo, Omega, LubriMatic, and UltraLube brands. The company, founded in 1909, is headquartered in Dixon, IL.