... pump for deep well 1.copper wire winding 2.copper end ring 3.one year warranty ... cost.National patent , retaining barrel , downdraft , high power, high flow, high-lift pump, downdraft pump is ... 1. 380V voltage deviation is no more than ±5%,frequency is 50HZ, three -phase power deviation is no more than ±1%. 2 ... the moving water surface, pump unit should be no more than 70m below the static water level. ...