190°F Fan Switch Thermostat Kit (1/8 & 3/8 NPT) Description Replacement 3/8 NPT thread-in temperature probe threads into water jacket port. Designed to work with Derale part numbers 16739 & 18739. Features Single stage fan control thermostat with 190°F turn-on temperature Turn-off temperature is preset at 175°F Fits into either a 3/8 NPT or 1/8 NPT port 3/8 NPT x 1/8 NPT bushing included