The Derale 16731 is a single-stage fan control thermostat with a 190 degree Fahrenheit turn-on temperature and a preset 175 degree Fahrenheit turn-off. The thread-in probe installs into a water jacket port and switches an electric fan on and off based on coolant temperature. An included bushing lets it fit either a 1/8 inch or 3/8 inch NPT port, and it is designed to work with Derale fan controllers such as part numbers 16739 and 18739.
Specifications:
- Type: Single-stage thread-in fan switch thermostat
- Turn-on temperature: 190 degrees Fahrenheit
- Turn-off temperature: 175 degrees Fahrenheit (preset)
- Probe thread: 3/8 inch NPT, fits 1/8 inch or 3/8 inch NPT port
- Included: 3/8 inch NPT x 1/8 inch NPT bushing
- Works with: Derale 16739 and 18739
- Part number: 16731
FAQ
At what temperature does the Derale 16731 switch the fan?
It turns the fan on at 190 degrees Fahrenheit and off at a preset 175 degrees Fahrenheit.
What port sizes does the 16731 fit?
The thread-in probe is 3/8 inch NPT, and the included bushing lets it fit either a 1/8 inch or 3/8 inch NPT port.
Where does the 16731 install?
The probe threads into a water jacket port to sense coolant temperature.

