Hydor 12V Koralia Controllable Circulation Pump Adjustable flow rate 100-260 gph Unique patented magnet-suction cup support allows for easy positioning anywhere in aquarium. Sphere shaped connection allows for desired flow positioning. Built in fish guard. All Koralia 12v models are super safe and are supplied with rubber waterproof cords and connectors. The Koralia 12V pumps are specifically designed for use connected to the Hydor Koralia Wavemaker system. IT CAN NOT BE USED WITHOUT THE Hydor Koralia Wavemaker