Novel design and generous, use the variable frequency technology, small power, large flow, high head, super mute and both sea and land. Use ceramic shaft, wear resistance, no rust, long service life, both fresh and sea water, do not contain copper element. This product realize free tool demolition, easy to clean. The outlet realize multistage over, suitable for a variety of pipe diameter connection. The locked-rotor protection funtion.(Immediately cut off power after water leaf card dead).