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Automatic Fan Control: Activates the cooling fan at 180°F and turns it off at 165°F for stable engine temperatures. 3/8" NPT Thread: Brass thread-in temperature probe fits any cooling system with a 3/8" NPT port. Application: Compatible with most automotive, truck, hot rod, and custom setups. Easy Installation: Threads directly into the engine block, radiator, manifold, or water outlet. Durable Build: Made from corrosion-resistant brass for reliable temperature sensing and long service life.