Lee's 50/65 Premium Undergravel Filter， 18-Inch by 36-Inch</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>The larger plate sizes reduce the number of plates required</li><li>The added strength of the UGF plates makes this filter most preferred by saltwater aquarists</li><li>Size: 18-inch by 36-inch</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/51y-pKvihVL.jpg' noproxy></br>