A Series Air Pumps are created 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.Adjustable Flow Control – Control dials allow each outlet to be independently controlled– Permits a precise, regulated airflow to aquarium devices– Single and double outlet models availableUltra-quiet Operation – Engineered noise dampening baffle chamber – Oversized rubber feet create outstanding stability– Oversized rubber feet stabilizers help prevent vibration and noisePowerful Air Delivery – Excellent output flow to pressure ratio– For usage with 1 or several air stones– Improves water circulation and oxygen levels for fish, plants, corals and beneficial bacteriaEnergy Efficient– Inexpensive to operate– Draws as little energy as 2W to 4WFlexible Installation– Space-saving rubber hang tag– In addition to horizontal positioning, pump is easily mountable to side wall of aquarium stand for less clutter