Wiring Device-Kellems Twist-Lock® Safety-Shroud® Locking Plug, 3-Phase Grounding Watertight Cord Mount, 250 VAC, 20 A, 3 hp, 3 Pole, 4 Wires, L15-20P NEMA Rating, Industrial Grade, NEMA 4/4X/12/IP66 Enclosure, 0.35 to 1.15 in Diameter Cord, -40 to 75 deg C, Screw Terminal, Composite, Black, 2.94 x 2.94 x 4.40 in