TurboFlotor has what they call a Multi which is convertable. It is expensive though, and like its other skimmers it is made of cheap extruded plastic. They work excellently, but they are made of thin easily breakable plastic. I own 14 Turboflotor 1000's and 12 of them have collection cups with one or more cracks. Luckily only one ever got a crack in the main body from being dropped 5 feet onto a concrete floor slab. If they were made out of cell cast plastic there probably would be no cracks at all, even on the dropped skimmer that had to be replaced. The Coralife Super Skimmer is also made of extruded plastic.