Screw Plug Immersion Heater, 7,500 W Watts, Sheath Material Copper, Screw Plug Material Brass, Watt Density 59.06 W/sq in, Heater Voltage 240V AC, 3 Phase, Overall Length 19 7/8 in, 2 in NPT, Enclosure Type NEMA 1, Min. Immersion Depth 16 in, Special Information Corrosion- Electrical Wiring Hardware, Recompacted Element Bends Restore Insulation Resistance After Forming, Silicone Resin Element Seal Standard, For Use With Clean Water, Non-Corrosive Material, Includes Screw Plug