1" 5500W non-resistored water heater screw-in element, Watt Density Classification: HWD, Input Voltage: 240, Wattage at 240V: 5500, Watt Density at 240V: 202W/sq. in, non-resistored, Outer Sheath Material: copper (with plating), Configuration: foldback, Element Diameter: 0.260", Element Length(flange to tip): 9.6", Mounting Type: Threaded, Nominal Thread Size: 1", Actual Thread Size(outside diameter): 1-9/32", Thread Type Series Designation: NPSM, Hex Head Size(across flats): 1-1/2", Threads per Inch: 11.5, **includes gaskets