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