NP-305 Submersible Pump The AQUATOP NP-305 fully submersible pump is powerful, yet quiet, and designed for very low energy consumption. Capable of moving 315 gallons per hour, the NP-305 is suitable for both fresh and saltwater aquarium use and is an excellent choice for water gardens or ponds. This versatile pump offers flow control and comes equipped with numerous multipurpose fittings for use as a powerhead or circulation pump.