Universal automotive in-line electric fan thermostat sensor switch. Adapter size is AN male with barb push-on hose fittings. Circuit closes at selected turn-on temperature and powers your fan. Turn-off temperature is always 15 degrees less than turn-on. Mounts anywhere on the transmission oil cooler hose near the inlet. Measures all fluid/liquid temperatures including water, coolant and oil. Designed to work with any car, truck, ATV, UTV, RV or rod project. Complete inline thermostat wiring kits listed in our store.