Estone New DC 3W 5.5V- 12V Submersible Water Pump Aquarium Fish Tank Fountain Pond Pump Flow adjustable water pump is designed fully submersible for both fresh water and saltwater. This pump creates water flow and aerates your aquarium to simulate natural ocean / river environment. The pump is a must have accessory for you fish tank, fountain and more. Submersible water pump for aquarium, fountain, fish pond, etc, Flow rate is adjustable with knob in front of the pump With 2 suction cups at the bottom and to be used in water only