Coralife LUFT Air Pump. High-Pressure Aquarium Air Pump 7.0 P.S.I. The Luft Pump produces high-pressure output 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, especially in deep-water applications.