Koller Products TOM Aquarium Stellar Mini Air Pump for 5 Gallon to 10 Gallon Aquariums Air pump for aquariums sized 5 to 10 gallons Maintains high oxygen levels while providing optimal water movement to keep fish healthy Single air port outlet; 0.73 liter-per-minute air volume; 2.07 PSI air pressure rating Heavy duty diaphragms deliver years of trouble-free use If we can be of any help please do not hesitate to contact us at customercare@kollerproducts.com, we'll take good care of you Single air port outlet 0.73 liter-per-minute air volume 2.07 PSI air pressure rating