EPAuto Industrial Type D 1/4-Inch Coupler and Plug Kit, 7 Pieces Quick and easy connect system Industrial Type D 1/4" Must have air fitting kit for air tools, air compressor, air nailer, air blow gun, pressure washer, air hose Package Includes: 3 Male Plugs, 2 Female Plugs, 1 Male Coupler and 1 Female Coupler Recommended use with Thread Seal Tape (Teflon tape)