The Grainger 14U398 is a 7.75 inch diameter tubular heating element insert made of Incoloy sheathed tubing. It has a wattage of 5500 watts at 240 volts and is 22 inches in length. This heating element has 1/2 inch NPT thread connections and is commonly used in water heaters, air handlers, unit heaters, and duct heaters. It has a maximum temperature rating of 750 degrees Fahrenheit. The heating element has an Incoloy sheath for corrosion resistance.