American Volt 200'f Turn-on Electric Fan Ground Thermostat Wiring Kit 3/8" Inch Npt Port Plug Universal fit for any automotive vehicle and electric fan. Activates by grounding single electric fan at preset temperature. 200'F turn-on temperature, 185'F turn-off temperature. 3/8" NPT thread-in brass probe. Probe typically threads into radiator, water outlet or manifold.