uxcell 12" Aquarium Tank Aeration Green Plastic Casing Bubble Air Stone Durable, washable and sintered by high temperature; Model: NAQ-106 It is an important instrument to successfully keep aquatic fish for respiration process Creates bubbles in fish tank while attached to an air pump(air pump is not included) Creates water currents and dazzling underwater scenes. An ideal tool to add oxygen to your hydroponic growing system.