Maxi-Jet multi-use water pumps are three pumps in one: power head, utility pump and now featuring circulation pump option.  Still the best power head for powering undergravel filters and running 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 power head 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.