Aqua-Tech Power Head Submersible Black Pump for Aquariums Aqua-Tech Power Head Submersible Pump for Aquariums. Featuring a compact design and laboratory-tested performance, the Marineland Penguin Submersible Power Head is a reliable choice for your tank. It's easy to set up and install, so you can enjoy powerful and constant water flow right away in both freshwater and marine aquariums. The Penguin Submersible Power Head maximizes oxygenation by increasing surface agitation. You can regulate the air flow to fit your needs with the custom air valve.