Automatic Flapper Style Switch Attaches to any SPX JohnsonPump Marine bilge pump through the T-slot, delivering full automatic bilge pumping action. For use with 6-, 12-, 24- and 32-volt systems. Electronic Float Switch Compact mechanical switch activates pump at 2 water level, deactivates pump at 3/4 water level. Mercury-free electronics are encapsulated in high-impact plastic. False-start prevention. 12-volt. Handles up to 15 amps. Ultima Switch No moving parts, no mercury, no exposed sensors and completely sealed. Activates at 2 water level and deactivates at 3/4 water level. Three-second delay prevents false starts. Handles pumps up to 20 amps at 12 or 24 volts. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Bilge Pumps.