Camco 3500W 240V 13.5"H Water Screw-In Heater Element. It is a high watt density of 150+ watts per square inch and fits most models of American, A.O. Smith, Bradford White, Craft Master, General Electric, GS Wood, Kenmore, Lochinvar, Maytag, Mor-Flo, Reliance, Rheem, Richmond, Ruud, Sears, State, & Whirlpool heaters. It comes with a gasket and detailed instructions. It has a minimum tank diameter of 14" and is UL listed. Comes with a 1 year warranty. UL listed. Gasket included.