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A plastic submersible pump is equipped with an electronic aqua sensor for clean water, the water starting level could be adjustable, and you could change to either manual control mode or automatic control mode when using the pump . This pump has a stainless steel pump base, the pump could keep working even in the condition  with a water level of 5mm. The pump also has a non-return valve which could avoid water backflow.
Junhe Model:Q4003A-1
Certificate Model:QSB-JH-4003A-1
Rated Power:400W
Voltage:230v/50Hz
Max pump height:7.0 m
Max pump rate :7000 l/h
Max submersible depth:7 m
Max.grain size:5mm
Max.pressure:0.7 bar
Dia of connecting pipe:1"G1"1-1/4"-G1-1/2"
Cable specification:H05RN-F3G0.75mm2
Length of cable:10 m
Lowest pump=mp starting level:5 mm
Lowest pump sucking level:1 mm
Max. medium temperature:35 C
LM031023