The motor is sealed in the body shell with resin for excellent waterproof performance, making it safe and reliable. Multi-functional design can be used for pumping, for fountains and aeration/oxygenation. This multiple application submersible water pump is perfect for simple powerhead use as well as adding vital oxygen to your aquarium fish tank and as part of your aquarium filtration system. Anti-friction ceramic shaft suitable for both salt and freshwater. Complete with hose and suction cups for fixing to the side of the aquariums. It comes with two output nozzles included (single outlet or dual outlet). Simple access to impeller allows for easy maintenance and cleaning. Venturi aeration nozzle supplied to create bubbles and increase oxygen levels of returning water. No air pump is needed in principle. Venturi effect: As water is pumped back into the tank, it can also be aerated by a venturi pipe. This accelerates the water flow and draws in a stream of air from above the surface.