Supreme Aquarium® Oxy-Flo 04240 AP-40 High Volume Aquarium Air Pump. SUPREME OXY-FLOW HIGH VOLUME AIR PUMPS are available in larger volume sizes: AP-20, AP-40, AP-60 and AP-100. All Supreme Air Pumps achieve high output by using a time-proven diaphragm design. Supreme Air Pumps can be used for large or multiple aquarium aeration and filtration due to their larger air output.