A portable device for delivering nitrogen to multiple tires includes a gas source and supply line connected to a controller. The device also includes a gas delivery line comprising a manifold with a plurality of outlets in fluid communication with each other. A gas delivery line is operably connected to the controller and a plurality of extension lines with engagement chucks are operably connected to the outlets. The controller controls the supply of gas to the gas delivery line and controls a relief valve for venting the gas delivery line. The device also includes a sensor and a processor connected the controller and sensor which accepts user inputs. The controller, manifold, and processor are affixed to a stand.