They assist water circulation in the aquarium as well as increasing the water surface area, allowing for a greater replenishment of oxygen and removal of harmful carbon dioxide from the water.
Colour may vary.
Air pumps can be found further down the page.
Made by one of the leading Chinese aquarium product manufacturers, these low priced air pumps are superb.
Each air pump comes with a 2 year guarantee (coil only: diaphragms are considered consumbables and are therefore excluded)