Features: * Specifically designed for use in Rubbermaid stock tanks * Installs in drain plug assembly * Thermostatically controlled for efficiency * No cord in water, unnoticed by livestock * 1,500 watts * Suitable for 100, 150, and 300 gallon tanks What"s In The Box: * Farm Innovators DPH-15 1500-Watt Stock Tank De-Icer Plug