Internal Aquarium Fish Tank Filter Submersible with Spraybar + Air Venturi Description: The AP range of internal filters are ideal for both freshwater and marine aquariums from 40 to 250 litres in size. These filters come complete with all accessories including a spray bar with venturi adapter, allowing air to be introduced into the aquarium, eliminating the need for a separate air pump. All filters come supplied complete with foam sponge for mechanical and biological filtration. There is a flow limiter on the front of the filter to allow the flow rate to be slowed if required depending on application.  The AP range of internal filters is currently available in five sizes. Please select the required model from the drop down menu above.