12 Inch (30 cm) Large Pond or Aquarium Airstone Bar Heavy Duty Bar Air Stone to successfully keep aquatic fish and plants aerated. Very durable, washable and sintered by high temperature. Creates water currents and underwater scenes, bubbles in fish tanks, aquariums, and ponds while attached to an air pump(air pump is not included). The airstones add oxygen to the water, as the bubbles aerate the water they also help circulating hydroponic nutrients invigorating the roots of plants and boosting healthy growth. Making for HAPPY fish... ? Requires Airpump to Operate ? Gives Large Volume of Diffused Air - Stainless Steel Nipple ? Sintered to 1000 Degrees for Fine Bubbles to improve aeration efficiency ? Fits 1/8th (4mm) to 5/16th (8mm) Airline Fittings ? 12 inches - 30cm Long - bumper bars on each side. 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.