AQUANEAT Aquarium Air Flow Control Valves 20PCS</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Two-Way Plastic Valve</li><li>They are made of plastic material for long time use.</li><li>Fits standard air line tubing aquarium and Co2 tubing with inner diameter about 4 mm</li><li>INCLUDES: 20 pieces of control valves</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/51-7AFP%2BZ-L.jpg' noproxy></br>