Aquatops PH Series is a fully submersible power head that runs efficiently and quietly at 317 gallons per hour while providing superior water movement in aquariums, preventing stagnant water conditions. This includes the optional venture air intake feature with air regulator allows for increased water aeration at a 22 watt pumping power. This series is easily fitted to and perfect for powering under gravel filtration systems. They can be used in both Freshwater and Saltwater aquariums systems. This is constructed of high strength and impact abs with a voltage of 120V / 60Hz.