Hydrofarm 2 AAPA110L 112W 110LPM Active Aqua Commercial Air Pumps w/12 Outlets 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 (6, 8, and 12) that can be individually opened or shut