The final automatic deflators come from CB Developments via Extreme Outback Products. These are some crazy little units that you can easily adjust from 3 to 13 psi with higher-pressure versions also available. To set the desired pressure, simply press down the plunger and turn to the setting. Then screw the deflators to your valve stem and a low whistling buzzing sound emanates from them till the pressure is reached. Though quick and easy to use, most deflators cannot be used during driving like the Trailhead and Staun versions, but the Extreme Outback is self-cleaning.