The Mencom MAC-4FR-4 Micro AC (1/2-20) female straight receptacle features a 4 Pin insert, 22 AWG wire, 12" lead length and 1/4" NPT mounting thread. The shell is nickel plated brass with gold plated copper alloy contacts. Wire is rated at 300V. Rated IP 69. Operating temperature -40 C to 105 C (-40 F to 221 F). Mencom MAC receptacles use an 1/2-20 coupling nut and have a dual C-coded keyway. While similar in appearance to the MDC M12 receptacles, they do have a different wiring color code.