A series air pumps are designed to significantly improve water circulation and essential oxygen levels for fish, plants, corals and beneficial bacteria. Hobbyists will appreciate a powerful air delivery that is designed with ultra-quiet operation and energy-efficiency in mind, in addition to adjustable flow control dials that allow each outlet to be independently controlled.. Features. Powerful air delivery provides excellent output flow-to-pressure ratio. Engineered noise dampening baffle chamber deliver an ultra-quiet operation. Oversized rubber feet stabilizers reduce vibration. Adjustable flow control dials allow each outlet to be independently controlled. Energy-efficient draws as little energy as 2w small model . Space saving rubber hang tag easily mounts to side of aquarium stand for less clutter. For use with 1 or several air stones