140'F automotive engine cooling fan thermostat switch. 1/8" inch NPT brass thread-in temperature probe sensor. Activates fan at 180 degrees and turns off at 125 degrees. Universal fit for any application with a 1/8" NPT port. Threads into engine block, radiator, manifold or water outlet. Measures temperature of any liquid including motor oil. Other sizes and temperatures can be found in this eBay listing.