The RSS-5LL switch can be used anytime you have a basin usage for the pump. It works by diaphragm. If the water reaches a certain level, it will shut off the pump. The pump plugs into the switch.
"On" level: 2"-3". "Off" level: .5"-1.5" when mounted to 5-MSP.
For pumps up through 1/3HP or the following Little Giant pumps: 5-MSP, 6-CIM-R, NK-1 & NK-2.