Rheem SP10869MM Screw-In 240-volt by 4500-watt Element, Premium Resistored Stainless Steel Element - 240V/4500W stainless steel resistored lwd - 1 in screw-in Watt density classification: lwd, input Voltage (V): 208, Input voltage (V): 240, wattage at 208V (W): 3380 Element diameter (in.): .316, Element length - Flange to tip (in.): 13.44, mounting Type: threaded, ACTUAL thread size - Outside diameter.): 1-9/32 Thread type series designation: NPSM, configuration: fold back, nominal thread size - (in.): 1, threads per inch: 11-1/2