Heavy Duty 7 Pole Plugs Plug Only, Round 82-2140,40 AMP @ 6-28V DC• 2, 1/2" mounting holes,Circuit identification on the back of the socket,Die-cast housing for superior corrosion resistance,Female ground pin for (ISO) to prevent improper connection,Meets and exceeds SAE J560 specifications,Sloped socket barrel allows for moisture drainage,Solid brass pin terminals for best conductivity,Terminals accept 16-10 gauge wires; 8 gauge ground wire