Johnson Pump Ultima Switch Solid-State Level Sensing. The detector cells are totally sealed and never in contact with the water will not corrode and are not affected by oil or foreign debris. No moving parts totally sealed solid state electronics and field detectors no mercury and no exposed sensors eliminate corrosion possibilities and makes the Ultima switch environmentally sensitive. Ultima activates at a 2" fluid level and deactivates at a 3/4" fluid level. An eight second delay prevents false starts. Ultima switch is rated to handle pumps up to 20 amps at 12 or 24 volts. Features of Johnson Pump Ultima Switch Solid-State Level Sensing: Ultima Switch Auto Bilge Pump Switch With Mirus field effect detector cells will not corrode and are not affected by oil or foreign debris No moving parts totally sealed no mercury and no exposed sensors 12/24V 20A max Included Accessories: Ultima Switch Solid-State Level Sensing Documentation Package Contents: Johnson Pump Ultima Switch Solid-State Level Sensing Johnson Pump 36303: Ultima Switch Solid-State Level Sensing