Mudder Air Bubble Stone Round Airstone for Aquarium Fish Tank Ponds， Grey， 4 Pack</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Create abundant small bubbles， suitable for aquarium， fish tank and circulation system</li><li>Durable， washable and stable; Safe for fish</li><li>Fit for 11.8 - 23 inches in fish tank size， 2W - 5W in air pump power; Jetting volume: 2L/ min</li><li>Suitable for 4 mm soft tube in inner diameter (Inlet connector size: approx. 3 mm internal， 4 mm external)</li><li>Come with 4 pack air stones， need to match with air pipe and oxygen pump for full usage</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/51iMakgDgIL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51yAsKysCPL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51RjyeDC8gL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41ynMLejvxL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/616TDF0tcdL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51IyKbWajTL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51hAmdlPw3L.jpg' noproxy></br>