Lee's 20L/29 Gallon Original Undergravel Filter - 12 x 30-Inches</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Made of special quality plastic which resists splitting and cracking</li><li>Also has optional flow-thru set-up for use with a power head</li><li>Size: 12 by 30 inches</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/41bQ3Vy42mL.jpg' noproxy></br>