Marineland Penguin Submersible Power Head 660R - Penguin Power Heads deliver constant flow with fully adjustable aeration and increased surface agitation. The custom air valve regulates air flow, the air filter eliminates noise and dust, and the intake strainer keeps debris from fouling the impeller. Unique two way versatility! The penguin 660R power head as a reverse flow power head, the penguin 660 delivers oxygenated water to even the deepest layers of the gravel bed. It includes a reverse flow elbow mount and sponge pre-filter.