Sintered Air Stone Bubble Aerator Airstone Oxygen Circulate Balance</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Diameter:4.72Inch</li><li>It produces fine bubbles making it efficient in the replacement of Oxygen in fish ponds， tanks or hydroponic systems.</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/41Rtq%2BbeYNL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51A2CRpxCdL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51DK58GwFxL.jpg' noproxy></br>