Compact mechanical switch offers a combination of reliable solid state electronics and a sealed float switch.• Compatibility: SPX FLOW Johnson Pump Cartridge Bilge Pumps• Voltage Rating: 12 Volt• With Wiring Harness: No• With Fuse Holder: No No Mercury Activates Pump At 2 Inch Water Level, Deactivates Pump At 3/4 Inch Water Level Switch Is Designed To Attach To The SPX FLOW Johnson Pump Cartridge Bilge Pumps | Bilge Pump Switch, Electro-Magnetic Float Switch; 15 Amp