Check the listing for details. DAYTON 3BY84 Tether Float,Piggyback,230VAC 3BY84. Condition: New. Listed at 90.39 USD. Float Switch These tether float switches are activated by a float that is attached to the pump by a flexible tether that can be adjusted so the pump starts and stops automatically at preset levels. They require more space to operate compared to vertical float switches since the flexible tether moves in an arc as the water level rises and falls in the sump basin.Sump and sewage float switches have a float that raises and lowers depending on the water level in the sump basin to automatically control switch operation. When water rises to a preset level in the sump basin the switch turns on and the pump starts. When the water is drained down the switch turns off and the pump stops. Sump and sewage diaphragm switches sense pressure against the diaphragm to detect how much water is present in th.