Designed for installation in coffee urns, steam tables and other shallow containers. These heaters are of two coil construction suitable for a 3-heat control switch. They are made to pass through a 3-5/8" diameter hole when the outlet box is removed. The heater element is installed in a 2-7/16" diameter hole in the bottom of the vessel or container. The heater is copper sheathed and has a 4" outlet box with locknut and gasket. UL listed and available in Titanium.