Purchased these back in 2014 when I got my Xterra. Set them up as directed and stashed them away. This month, while towing a small travel trailer I got stuck in the sand. Dug the deflators out, put one on each tire, and in about 10 minutes the hissing stopped. Used a shovel to remove some of the sand behind each wheel, put it in low range and both SUV & trailer came out without a problem.I also purchased a Viair 00088 88P Portable Air Compressor and it worked great to reinflate the tires. I did let the compressor cool between each tire before doing the next tire.