Fluval A Series Air Pumps are designed to significantly improve water circulation and essential oxygen levels for fish, plants, corals and beneficial bacteria.Fluval Air Pump A402+ powerful air delivery - provides excellent output flow-to-pressure ratio+ engineered noise dampening baffle chamber deliver a 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 4 W+ space saving rubber hang tag easily mounts to side of aquarium stand for less clutter+ for use with 1 or several air stonestechnical data Fluval Air Pump A402total output: 330-370 LPHoutlet: doublewattage: 4 Waquariums up to: 600 L