Experience the efficiency of the Top Fin Air 4000 Oxygen Air Pump, designed for fresh water aquariums. This robust model has been tested and is confirmed to work flawlessly, ensuring your aquatic life enjoys an optimal oxygen environment. Crafted for compatibility and performance, the Top Fin brand is synonymous with reliability. While the tank capacity is unspecified, rest assured that this pump is engineered to meet the needs of various aquarium sizes, making it a versatile addition to your aquatic setup.