Suitable for all models Koshin  PBX submersible Pump with  float switch (options). 
The pump start automaticaly when the water level rises and the float comes up to the ON water level, and stops automaticaly when the water level falls and the float comes down to the OFF water level.
The ON and OFF water levels can be adjusted by loosening the cordband bolt. However, the length of the cord between the cord band and the float switch should be between 60 mm and 200mm, otherwise the float switchwill not operate normaly.