The Coralife Luft Aquarium Air Pump produces a high-pressure output of 7.0 PSI and 4.0 LPM with a quiet operation. Ideal for high-resistance and multiple-output applications. Perfect for protein skimmers, ozone/oxygen reactors and other high-pressure/high-flow devices. Also suitable for limewood and other airstones, foam filters, corner filters, under-gravel filters and air-driven ornaments, even in deep-water applications. The Luft pump features a rheostat control to regulate pressure and flow rate