The Coilhose K0404DL is a 1/4-Inch FPT Hex Coupling. With this Coupler you can connect, adapt or control any air or water line. Features: * 1/4 x 1/4-Inch female NPT * Solid brass construction * Designed for use with brass, copper or iron pipe What"s In the Box: * Coilhose K0404DL 1/4-Inch FPT Hex Coupling