Supreme Hydroponics 14635 Airline Check Valve, Fits standard 3/16-Inch Tubing
<div style="text-align: left;"><strong>[Product Information]</strong><br>
<ul>
<li>Helps prevent backflow through tubing</li>
<li>Can be put in-line between outlet and air pump</li>
<li>Use with standard airline tubing</li>
</ul>
</div>
<img src="http://ecx.images-amazon.com/images/I/31jactOhY6L.jpg" noproxy>