Flex-A-Lite Compact Adjustable Electric Fan Controller and Relay Kit with Thread-In Temperature Probe This compact controller and electric fan relay kit features potted electronics for water resistance and protection from vibration Flex-A-Lite Control Module with two temperature probe adapter bushings to fit 1/4-, 3/8- and 1/2-inch NPT threaded ports Car parts fan controller provides adjustable fan activation from approximately 160 to 220 degrees Fahrenheit and activates the electric fan whenever the A/C is on for optimum A/C performance and engine cooling The Flex-A-Lite Compact Adjustable Fan Controller is the perfect companion to automotive electric single- and dual-fan systems