This Snap-on Williams 8RH38D fitting is a high flow, non-valved, quick-disconnect plug-and-socket set for applications where maximum flow is required. It is made of brass for resistance to corrosion. The socket has a 3/8" male National Pipe Taper Fuel (NPTF) connection with 18 threads per inch (tpi) for connecting to a female hose fitting and a 1-3/16" female coupler connection with 16 tpi. The plug has a 3/8" female NPTF connection with 18 tpi for connecting to a male hose fitting and a 1-3/16" male coupler connection with 20 tpi. This plug-and-coupler set is suitable for use in industrial and agricultural applications and on mobile equipment.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.Snap-On Industrial manufactures hand tools and diagnostic equipment under the Williams Tools, Bahco, and CDI Torque Products brands. The company, founded in 1920, is headquartered in Kenosha, WI.What"s in the Box?8RH38DF Socket8RH38DM Plug