5 Inch (127mm) Round Plate Airstone for Pond or Aquarium Koi Ponds Aquariums Large Air Stone Diffuser, Hydroponics Aquarium Fish Tank Pump Aerator Diffuser Fine Bubbles: The plate air stone disc produces lots of rich micro bubbles of oxygen. A great way to oxygenate your hydroponic growing systems, koi fish ponds, water gardens, aquariums and enliven the aquatic life and create a healthy habitat. Made of minerals that are sintered at a high temperature, to encourage longer lasting product. Perfect for both fresh and salt water environments like fish tanks, water gardens, bird baths, ponds, DWC reservoirs, aquariums and more. Airflow dependent on depth of Pond and output of air pump. Pump required, Not Included... ? 127 mm / 5 inch Diameter ? Dual Standard Nipple 3/16th 5/16th ? Fine Diffuse of Bubbles ? Heavy Design Suitable for all Ponds and Large Aquariums Pump required, not included We sell many aquatic products online, check out our store!!! Terms and Conditions. We use all approved payment methods. Sales Tax will be added to all shipments based on regulations. We always try to combine purchases, please contact us directly for a personal service. You will be notified on the day that your goods have been dispatched via e-mail with tracking which is used on all purchases. Please note that if there are any problems, contact us first via e-mail giving full details of any problem along with your user ID. We use USPS and UPS as our chosen carriers shipments to Hawaii, Alaska Puerto Rico may incur surcharges, contact will be made to advise before shipment at which point the order can be canceled if desired. Orders placed on Saturday/Sunday Public Holidays will be processed next working day. We pride ourselves on excellent feedback, if any part of the buying experience is not to your satisfaction, please contact us to rectify before leaving feedback. By committing to buy you are agreeing to the Terms Conditions stated above.