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. Brass thread-in or push-in probe thermostat kit. Closes electrical circuit at temperature and passes power. Various temperature ranges to suit your project needs. Dual .25 inch standard pin electrical terminals. Measures coolant, oil, water temperatures. For engine block, radiator, cylinder head, manifold, outlet tube Complete thermostat wiring kits listed in our store. Includes: (1) Thermostat Sensor Switch (1) Brass Temperature Probe