Screw Plug Immersion Heater, 7,500 W Watts, Sheath Material Steel, Screw Plug Material Steel, Watt Density 20.1 W/sq in, Heater Voltage 480V AC, 3 Phase, Overall Length 47 3/16 in, 2 in NPT, Enclosure Type NEMA 1, Min. Immersion Depth 43 1/2 in, Special Information Corrosion- Electrical Wiring Hardware, Recompacted Element Bends Restore Insulation Resistance After Forming, Silicone Resin Element Seal Standard, For Use With Non-Corrosive Material, Oil Applications, Includes Screw Plug