American Volt 4 Pack 160'f 1/2" Inch Electric Fan Thermostat Engine Coolant Grounding Switch 4 pack automotive engine grounding fan switches. 3/8" NPT brass thread-in temperature probe with 1/2" NPT adaptor. Switch grounds fan at 160 degrees and turns off fan at 145 degrees. Universal fit for any application with a 1/2" NPT threaded port. Threads into engine block, radiator, manifold, water outlet etc.