Aqua-Tech Power Head Submersible Black Pump for Aquariums features a compact design and laboratory-tested performance and 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 Aqua-Tech Power Head Submersible Pump improves circulation and increases filtration in your aquarium. The pump outlasts and outperforms air pumps by delivering a high-powered stream of oxygen-rich water to the filter bed and maintains a powerful constant flow rate. The pump is easy to install and will fit behind aquarium decorations. It can also be removed easily to clean the aquarium. Includes a 10-foot power cord. Pump measures 4.0 in. x 3.5 in. x 8.5 in.