Screw Plug Immersion Heater, 1,500 W Watts, Sheath Material Steel, Screw Plug Material Steel, Watt Density 21.47 W/sq in, Heater Voltage 120V AC, 1 Phase, Overall Length 23 9/16 in, Control Range 60 Degrees to 250 Degrees F, 1 1/4 in NPT, Enclosure Type NEMA 1, Min. Immersion Depth 18 1/2 in, Special Information Corrosion- Electrical Wiring Hardware, Recompacted Element Bends Restore Insulation Resistance After Forming, Silicone Resin Element Seal Standard