Nonpressure Rated Flanged Heater 4 000 W Watts Sheath Material Incoloy(R)800 Watt Density 27 sq in Flange Size 3-1/2 x 3-1/2 in Heater Voltage 480V AC 3 Phase Overall Length 19 3/8 in Min Immersion Depth 17 7/8 in Flange Material Steel Includes Gasket