Features: * Fits: * General Furnace humidifier models: 709, 990, 1040, 1042, 1137, SL16 (990-13) * Hamilton models: 10HF (EP036) * Williamson Power models: 500 * High output * Water efficient * Ceramic coated metal water pad What"s In The Box: * Bestair G13 General / Hamilton Metal Waterpad