Maxi-jet multi-use water pumps are three pumps in one: powerhead, utility pump and now featuring circulation pump option. Still the best powerhead for powering undergravel filters and running with wave maker timers, as well as running small fountains, calcium reactors and skimmers. New to the maxi-jet, the conversion kit in the box to turn the powerhead into a prop style circulation pump for ultimate water movement inside the aquarium for the least amount of energy. The most fully adaptable pump available.