Wiring Device-Kellems Twist-Lock® Insulgrip® Connector, 3-Phase Female Grounding Shrouded Standard Watertight Cord Mount, 480 VAC, 20 A, 5 hp, 3 Pole, 4 Wires, L16-20R NEMA Rating, IP66 Enclosure, 0.35 to 1.15 in Diameter Cord, -40 to 75 deg C, Pressure Screw Terminal, Composite, Black/White, 2.75 x 2.75 x 4.4 in,