American Volt 4-pack 210 Degree Electric Cooling Fan Thermostat Temperature Sensor Switch 3/8" 4 pack of 210'F automotive engine grounding fan switches. 3/8" NPT brass thread-in temperature probe. Activates fan at 210 degrees and turns off at 195 degrees. Universal fit for any application with a 3/8" NPT port. Threads into engine block, radiator, manifold or water outlet.