Got yourself a 4x4 Sprinter? Here's a gadget you really shouldn't leave home without. When you get to the trail, you're going to want to deflate your tires for added traction and a softer ride on those washboard roads. Deflate your tires quickly and accurately.
Make sure to also carry an air compressor when you get back to the highway.
Simple to use, comes in a canvas pouch for storage. We use these all the time, best deflator out there period.