I have one, used H.O.T. (Hang-On-Tank) Magnum 250 Canister Filter. Just replaced gaskets and includes various spare parts including an additional filter body, impeller, etc. Great for polishing water and/or running activated carbon. Recommended for aquariums up to 55 gallons. Just add a filter sleeve and media. Asking price $20 obo.
Description: The Hang-On-Tank (H.O.T.) Magnum is actually two filters in one. It is perfect for everyday filtration or as a convenient maintenance filter for clean polished water. The easy setup design makes it simple to switch from a dedicated filter that provides efficient mechanical and chemical filtration to a water-polishing micron filter. Self-starting pump silently directs a certified 250 gallons per hour flow rate for exceptional filtration and water movement. Snap-lock, leak-proof connectors eliminate the need for additional hoses or tubing. UL-Listed. 8 ft cord.
Includes: H.O.T. Magnum Canister Filter, Carbon/Media Container.