Wiring Device-Kellems Twist-Lock® Locking Plug, 3-Phase Non-Shrouded Watertight Cord Mount, 480 VAC, 20 A, 5 hp, 3 Pole, 4 Wires, L16-20P NEMA Rating, Industrial Grade, NEMA 4/4X/6/6P/12/IP65/IP66/IP67 Enclosure, 3/8 to 7/8 in Diameter Cord, -40 to 60 deg C, Screw Terminal, Elastomer/Composite, Yellow, 2.51 x 2.51 x 3.96 in