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TetraTec Deep Water Air Pumps were designed to pump large quantities of air, even in deep aquariums where oxygen levels are low. They are also an excellent choice for driving protein skimmers, and have power to drive multiple airstones in one or more tanks. Find the Model you need based on your aquarium depth in inches and number of air devices you have in your aquarium. DW 12, for tanks of 12"" to 24"" with 1 to 2 air devices. DW18, for tanks 18"" to 36"" with 2 to 4 air devices. DW24-2, for tanks 18"" to 48"" with 3 to 6 air devices. DW96, for tanks 24"" to 96"" with 2 to 6 air devices. DW96-2, for tanks 24"" to 96"" with 3 to 10 air devices.