Electric radiator cooling fan thermostat sensor temperature switch. Activates at the turn-on temperature and can power or ground your fan. Length from the top of the brass probe threads to the tip is 0.5" inches. Threads into block port, radiator, engine cooler or tapped hose line. Measures all liquid temperatures including water, coolant and oil. Universal dual pin electric cooling fan activating thermostat switch. Standard NPT sized solid brass thread-in temperature probe sensor. Preset to power fan or 12v accessory at the selected temperature. Threads into block port, radiator, engine cooler or tapped hose line. Measures temp of any liquid including oil, water and coolant fluid.