De Icer 3 In 1 Multi Thermostat DT15 Group_Bar Somnus 2P This design and procedure have This design and procedure have been under development and testing by Stone and veterinarians since 1999 Kow Ball Instructions floater or drain plug de icer Can be converted from a floating to a sinking de icer by simply removing the cover and the float and turning the de icer upside down to rest on the bottom of the tank Sturdy feet support the unit off the tank bottom when operating as a sinking de icer Durable aluminum base Keeps entire tank ice free without overheating the water Multiple thermostat control Large floater or drain plug de icer Can be converted from a floating to a sinking