This innovative, patented fast deflation tire valve allows you to quickly deflate your tires in a matter of seconds. Here's how it works: Unscrew the valve stem cover and place your preferred pressure gauge onto the valve. Now simply slide gate cover out and watch your air gauge real-time as the pressure drops. Slide the gate cover closed and replace the cap...you're done. The toggle action allows you to precisely throttle the air to hit your exact desired pressure. It's fast... very fast. You can expect tire deflation from 35 PSI TO 10 PSI IN LESS THAN 15 SECONDS. [Based on a 35” tire]