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For the ultimate in time savings with a portable air system check out this Package C. The key element here is the set of Monster Valves for saving time in both inflating and deflating larger tires especially if they are on a full-size requiring higher tire pressures. These Monster Valves will deflate a 39" tire 1 PSI per Second! Use them and the special Monster Chuck to inflate in half the time it takes through your standard valves! The special Monster-Ready Tire inflator is built for the Monster Chuck.