This Active Aqua AS2FLEX 2-foot flexible air stone is for use with your air pump and helps improve your plants' growth by adding oxygen to the nutrients in your hydroponic, aquarium, or waterfarm systems. It releases thousands of bubbles that aerate water and transport toxins from water near the substrate to the surface for dissipation. This air stone will extend the life of your nutrient solution, help keep roots healthy, and promotes exceptional growth. Bend this flexible air stone into any shape you need to deliver air where you need it most! For use with 3/16-inch inside diameter tubing.