Wiring Device-Kellems Twist-Lock® Insulgrip® Locking Female Connector, 3-Phase Heavy Duty Insulated Non-Grounding Shrouded Standard Watertight Cord Mount, 480 VAC, 50 A, 3 Pole, 4 Wires, Industrial Grade, NEMA 4/4X/12/IP66 Enclosure, 3/4 to 1-1/8 in Diameter Cord, -40 to 75 deg C, Pressure Screw Terminal, Nylon, Black/White, 6.5 x 2.56 x 2.5 in