Coralife's Luft Pump produces a high-pressure output ideal for protein skimmers; reactors; and other high pressure/high flow devices. The Luft Pump's rugged construction features a coated coil; a durable rubber diaphragm and ozone-resistant materials to ensure years of reliable performance. The pump also features an adjustable rheostat; allowing air flow rate and pressure to be fully regulated to suit the requirements of any air-driven device. The Luft Pump has one outlet with a psi rating of 7.0. Pump measures 5 in. x 3 in. x 2 in. For more information on aquarium aeration; please see our article on Air Pumps.