The Oceanrunner pumps (Needle Wheel And Normal Impeller) are powerful universal pumps to be used as circulation pumps in both salt and freshwater aquaria. Each Oceanrunner pump is housed in a rugged casing that allows attachment to the handy mounting plate in three convenient orientations. Equally at home submerged or run externally, these pumps are suited to almost any aquarium application. Oversized and polished ceramic shafts, spanning most of the housing length, stabilize large and powerful impellor assemblies. Every Oceanrunner pump is powered by an energy saving motor, which moves more water per watt of electricity and produces less heat per gallon an hour. All these qualities ensure cool, quiet, and trouble free performance for years to come.