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A drainage pump is used to drain the liquid in stagnant pool and reservoir. It is included in centrifugal pumps. It’s working principle is that the liquids have their pressure improved with the help of inertial centrifugal force gained from the revolving impellers in high speed. We have below types for your reference: QW(WQ), WL, JYWQ, YW, AS, ZW,AV and etc. Contact sales@ekahip.com to get more about drainage pumps.