Marineland brand is the world's leading brand of innovative equipment and environments for consumers wishing to create the ultimate aquatic showcase Committed to fishkeeping success for over 40 years the brand is the professional's choice for commercial display systems and scientific research Whatever you're passionate about – freshwater or saltwater big or small beauty or science – make your aquarium your own Marineland Penguin Submersible Power Head delivers constant flow in freshwater and marine aquariums Fully adjustable aeration maximizes oxygenation in freshwater aquariums It's the perfect upgrade to your undergravel system replacing the need for independent air pumps and stones In marine aquariums flexible mounting options and fully adjustable outlet make this power head the ideal choice to add necessary water flow to your reef aquarium This reliable device delivers powerful constant water flow to maximize oxygenation It includes an adjustable aeration valve along with a flow diffuser for directed water flow Select the proper size pump for your tank Available in three sizes Model 550 (145 GPH) 660 (170 GPH) and 1140 (300 GPH) Marineland aquarium pumps provide powerful dependable water circulation and aeration Versatile and easy-to-use Marineland pumps are available in a range of sizes to handle the water flow and oxygenation needs of aquariums at rates of 100 to 1300 GPH