Mini Monster Tire Deflator Valves Set of 5 from Power Tank. If you want an Economical yet Super fast way to deflate your big tires here it is. MINI MONSTERS are deflation valves that are easily installed into your wheels.
With a twist of the little knob your tire pressures will drop quickly. They will deflate a 35 Inch tire faster than 1 PSI per second. These are also great for deflating RV tires before going on the sand.

To install just drill a 7/16 Inch hole, tap it with a 1/4 Inch pipe thread tap, and screw the valves in. No tire removal is necessary. These are also available in sets of four valves and with a clip-on pressure gauge so you know when to shut the valves at the right pressure.
Steve recommends getting it with the clip-on tire inflator with gauge (TIG-8200, TIG-8300). This way you can use the gauge to monitor pressures while deflating and also use the inflator for quick and easy inflations.
Details:

• Sold as Set of 5
• Deflate a 35 Inch tire faster than 1 PSI per second
• No tire removal needed