Patent ID: 8196616

Claim:
A device for replacing a first gas mixture contained within each of a plurality of tires with a second gas mixture having a predetermined concentration of nitrogen, wherein the device performs at least one set of evacuations of the tires and charging of the tires with a third gas mixture predominantly comprising nitrogen to obtain the second gas mixture, the device comprising: a nitrogen gas source; a gas supply line operably connected between said nitrogen gas source and a controller; a gas delivery line comprising a manifold with a plurality of outlets that are in fluid communication with each other, said gas delivery line operably connected to said controller; a plurality of extension lines each comprising an engagement chuck at a distal end thereof, wherein each extension line is operably connected to a corresponding one of said plurality of outlets; said controller operable to control the supply of gas from said gas supply line to said gas delivery line and further operable to control a relief valve for venting said gas mixture in the tires; a processor operably connected to said controller and operable to accept user input; and a stand wherein the controller, manifold, and processor are affixed thereto, wherein the processor controls the controller based on a predetermined duty cycle.