KollerCraft TOM Aquarium Stellar Air Pump for 60 Gallon to 100 Gallon Aquariums Air pump for aquariums sized 60-gallons to 100 gallons Maintains high oxygen levels while providing optimal water movement to keep fish healthy Dual air port outlets; 2.0 liter-per-minute air volume (per outlet); 3.1 PSI air pressure rating (per outlet) Heavy duty diaphragms deliver years of trouble-free use