Aquarium or Water Garden Pond Airstone 2"/ 50mm Ball - Twin Pack, Ball Type Air Stone Diffuser for Water Garden Koi Fish Ponds or Aquariums, Saltwater/Reef/Marine Aquariums and hydroponic use

High quality Pond or Water Garden air stone that will give a rich micro bubbles of oxygen. Airflow dependent on depth of Pond or Water Garden and output of air pump. Dual Nipple Fitting for all standard airlines. Budget Two Inch Ball Pond Airstone (Pack of Two) 50mm (2 Inch) Pond airstone, fits all standard airline sizes. 50mm (2 Inch) Diameter Pond Airstone 3/16 (4mm) Fitting or 5/16th (8mm) for airline Fits Standard Airline Sizes Long Lasting Material Value 2 Pack Aeration stones are called air stones, discs, bubblers or diffusers and come in many shapes, sizes, colors and coarseness levels. Made of porous stone, its main purpose is to gradually diffuse micro air bubbles through your water with the help of a pond pump and tubing. They do not clog and give a better distribution of air with finer bubbles than other types of aeration systems. Spherical and cylindrical shaped airstones are also available in a range of sizes. Sintered airstones are very durable and extremely easy to clean. They are safe for all types of lakes, ponds, fresh water aquariums, salt water or marine fish tanks.