Triple Heater Module, Rainbow Lifegard. Triple capacity module holds heater 32 inches in length. DOES NOT INCLUDE AQUARIUM HEATER. Compression coupling allows easy installation and removal of heater. Accepts 1 inch or 3/4 inch diameter of aquarium heater. Clear cap to view 'On' light of heater. Removes unsightly and easily damaged heater from aquarium. Includes 3/4 inch threaded reducer bushings if threaded installation is desired. Filter dimensions 34-1/2-inches tall by 7-inches wide by 4-3/4 inches deep. Accepts up to a 300 watt heater.