Learn from my mistake and just buy them the first time and save money. I risked $30 and wasn't entirely satisfied. The first key difference is that Staun deflators deflate much more quickly, primarily because they "click" immediately upon reaching the set pressure. In contrast, the cheaper ones just get narrower, so the less air coming out of the narrower one, it lasts longer. I blew all 4 tires from 35 PSI to 18 PSI in about 5 minutes. This includes taking the valve caps off and putting themโฆ