This Dixon Valve DCP21 coupler plug for is suitable for connecting the end of a hose or tool inlet to a coupler socket (not included). It is made of steel for strength and resistance to corrosion and has a 1/4" male National Pipe Taper (NPT) connection for connecting to a TBD and a 1/4" coupler connection. It has a maximum pressure rating of 300 pounds per square inch (psi) and a temperature range of -40 to +250 degrees F. This Industrial/Milton or M-style (MIL-C-4109F/A-A-59439) air hose coupler plug interchanges with a wide variety of sockets or tools. This quick-connect plug is suitable for use with compressed air systems.

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.

Dixon Valve & Coupling Company manufactures pipe and hose fittings and accessories. The company, founded in 1916, is headquartered in Chestertown, MD.