Farm Innovators Model DPH-15 Drain Plug De-Icer For Rubbermaid Stock Tanks, 1,500-Watt Custom designed for use in all Rubbermaid stock tanks Thermostatically controlled to operate only when necessary Unit is unnoticed by livestock - no cord in water Easy to install and is safe in all plastic tanks Made in USA Installs easily in minutes in all Rubbermaid stock tanks As a drain plug heater, it remains unnoticed by livestock with no cord in the water Safe in plastic tanks 1,500 Watts