like the windmill,force by the water pressure,it work as cartwheel Item #DescriptionConnection(G) SpecifcationsPressureDischarge(M3/h)Height(M)Diameter(M)2170Screw Nozzle1 1/2"80-1505--81.5-31.5-221711"80-1504--51.5-21-1.5 Fountain Windmill Nozzle,fountain nozzle,Swimming Pool Nozzle