Keep a spare tank in the hangar filled and ready to go with our Oxygen Bottle, Valve, and Gauge assembly. Simply remove the regulstor from one bottle and install it on your spare bottle. Increase the flexiblty and utility of your oxygen system with a standby oxygen bottle from Aerox. Select from a variety of sizes, A, C, D, E, and M. Includes the popular "Fill my Bottle" option for an additional charge. Filled bottles are considered Hazmat by the DOT and are required to go by ground UPS.