American Volt 180'f Electric Radiator Fan Ground Thermostat 1/4" Inch Npt Sensor Thermo Switch 180'F automotive engine grounding fan switch. 1/4" NPT brass thread-in temperature probe. Activates fan at 180 degrees and turns off at 165 degrees. Universal fit for any application with a 1/4" NPT port. Threads into engine block, radiator, manifold or water outlet.