ZOIC Commercial Air Pump, 317 GPH 2.32 PSI 20watts 110V Electromagnetic Hydroponics,Aquarium,Pond Air Pump,Fish Tanks Ideal for running several Waterfarms or multiple air stones at once.Electrical magnetic air compressor in a high quality aluminum alloy case. Wear and tear-resistant material for cylinder and piston. High pressure and high output.Comes with multi-outlet divider that can be individually opened or shut. Special artificial rubber to keep a steady air flow output and pressure that can be adjusted freely. This 110-volt, 20-watt, 317GPH commercial pump includes a six-outlet air divider and 1/4-inch-ID connection tubing