The Hydor Circulation Pump for Aquariums 180 is a compact pump that is ideal for creating water movement and circulation in aquariums and terrariums. Water flow is fully adjustable using the integrated control knob, and the direcion of the water flow is also easily adjusted thanks to the fully articulating sphere joint. This energy efficient pump also includes Hydor's patented magnet-suction cup support system, enabling secure and unrestricted placement within your aquarium system. The Circulation Pump for Aquariums 180 is suitable for use with timers for added control. Suitable for both freshwater and saltwater applications. 180 gph. 4W. 60Hz. cUL Listed.