[header] How to use an oxygen tank [title] Slide the plastic covering off of the top valve on your tank. [step] There may be a plastic sheath that fits around the top nozzle on your oxygen tank. Before you can attach the regulator to the tank, you'll have to remove it. 
Usually, you can simply slide the piece off or you may have to peel it away from the nozzle. [title] Line up the regulator with the top valve on the tank.