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No additional parts required comes with 20' of water level sensor wire.
(light gauge wire 16-22 can be used to add more if needed)
Unit mounts to back of solar panels and plugs into panels and pump. Leads go to storage tank and placed at the desired cut off level will shut the power off to the pump when water level reaches the ends of the wire. Power will be resumed to pump when water level falls away. Has an 8 to 10 second delay so waves won't surge the pump.