Screw Plug Immersion Heater, 18,000 W Watts, Sheath Material Copper, Screw Plug Material Brass, Watt Density 44 sq in, Heater Voltage 480V AC, 3 Phase, Overall Length 51 3/4 in, 2 1/2 in NPT, Enclosure Type NEMA 1, Min. Immersion Depth 47 3/8 in