The Marineland Penguin 660 Power Head delivers a constant flow of water and provides increased surface agitation with a fully adjustable aeration feature. This maximizes oxygenation throughout an under gravel filter to provide a viable biological filtration site for the growth of beneficial bacteria. The Penguin 660R Power Sponge Filter features a reusable sponge that slides off easily for cleaning or replacement. And because it is so compact, it can easily be concealed behind rocks, plants or corals to create a unique waterfall effect. The mounting system provides total mounting versatility and the lift tube adapter fits all popular diameters and heights. The adjustable mounting bracket includes an optional suction cup mount. The powerhead also includes a venturi with an adjustable aeration valve and 8" of tubing to maximize oxygenation. Penguin's single moving part construction means no messy assembly, no oiling and virtually no maintenance. Ideal for both freshwater and saltwater aquariums.