The Johnson Pump / Mayfair Marine 12 Volt Electro-Magnetic Float Switch is made of high-impact plastic and draws 15 amps. Fully submersible, this float switch is corrosion resistant and turns on at 2 and 3/4 inches (6.98 centimeters) of fluid and turns off at 3/4th an inch (1.91 centimeters) of fluid.