Oase Aquarius pumps are very simple, and effective fountain pumps. Aquarius comes in 4 different sizes to suit many different ponds and applications. These fountain pumps come with many great features, including 3 different fountain heads and a small ball-like joint in the fountain stem. This joint means that even if the base of the pump is slightly out, you can still get the fountain perfectly straight. Aquarius pumps can also be used to run small waterfalls and even filter systems. A second outlet on the fountain stem allows another feed of water to a waterfall or fountain. The two feeds are adjustable using a flow-regulator attached to the founatin stem, allowing control over the fountain height, and the secondary flow.