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30 or 150 gallon sizes. Submersible powerhead for fresh or saltwater aquariums Ideal for use with undergravel filters Rotational outlet directs aquarium water flow Provide healthy water movement in reef aquariums Tapered base fits uplift tubes from 3/4"" to 1-1/8"" Attach to side of tank with suction cups (included) Includes 18"" airline tubing Six foot electrival cord Top Fin Tips For filtering larger size aquariums, use multiple powerheads on undergravel filter uplift tubes to provide a combined hourly flow rate of 3-4 times the tank size. When using a powerhead in a freshwater tank for aeration or water circulation, an hourly flow rate of 2-3 times the tank size is sufficient. Saltwater tanks should circulate water a minimum of 3-4 times per hour.