I can drain it of water to water level 1mm. I incorporate a check valve. I incorporate a motor protector. 残水排水用 of the elevated water tanks such as a building, the apartment. It is for stagnant water, the drainage of the underpass. Non-automatic driving form power supply cord length: 5m discharge (L/min): All 110 lift (m): 11 frequency (Hz): 50-caliber of (mm): 25 power supply (V): Single phase 100 electric current (A): 6.7 output (kW): 0.5 power supply cord length (m): 5 discharge, all lift is the maximums.