Abstract: A gas cylinder transport cap is described. The cap has a bottom opening adapted for reversible attachment to a gas cylinder, where the attached cap surrounds a cylinder valve coupled to the gas cylinder. The cap also has a side surface which at least in part defines the perimeter of the bottom opening, where the side surface include a plurality of side openings; and a top surface formed on an opposite side of the cap from the bottom surface, where the top surface includes a top opening. The side openings and top opening improve transmissions of radio-frequency signals from a RFID device positioned inside the cylinder cap when the cap is attached to the gas cylinder. A method of tracking a gas cylinder transported between a first and second location is also described.