Screw Plug Immersion Heater, 1,500 W Watts, Sheath Material Copper, Screw Plug Material Brass, Watt Density 90.26 W/sq in, Heater Voltage 120V AC, 1 Phase, Overall Length 15 5/16 in, Control Range 60 Degrees to 250 Degrees F, 1 in NPT, Enclosure Type NEMA 1, Min. Immersion Depth 9 1/4 in, Special Information Corrosion- Electrical Wiring Hardware, Recompacted Element Bends Restore Insulation Resistance After Forming, Silicone Resin Element Seal Standard