Main QGD serious screw submersible pump with seamless and high quality materials,the use of oil-filled pump with high head,low energy,long life.The body diameter is small,easy to use,high efficient .Unit for industrial enterprises,and domestic tap water.Submersible screw pump should be less than 1 mm diameter particles,solid impurities content of less than 1% of the water used to prohibit the use of the water with sediment,the sand will prevent the pump motor burning death card.