Lee's Aquarium & Pet Products Under Gravel Filter, Original, 15/20 gallon
A trouble-free biological filter designed with adjustable 1"-daimter uplift tubes for better water circulation and multiple-plate construction for easy installation. Includes airline tubing and Discard-A-Stone and features the fish-saver elbow. Advanced design allows a separate plate installation and allso has optional flow-thru set-up for use with a power head. Made of special quality plastic which resists splitting and cracking.