The RS submersible pump is made of high-quality plastic. This pump can be used for pumping pure water. In case of too low or no water level, the pump stops automatically to restart after 4 minutes for 3 seconds. If sufficient liquid is present, the pump continues to run; if the water level is too low or there is no water, the pump automatically shuts down again. The RS 25-E pumps liquids down to 3 mm.