Don't worry, if you ordered more than one gas exchange, you can return all of your empty cylinders in the box that just came with the full ones. Simply affix the return label and drop them off at your nearest UPS pick-up location. Best of all, you only need one label for the whole box.
Check out our Online Exchange guide below to learn more.
Sparkle Alert Regarding Coronavirus (COVID-19): If your order was placed March 1st, 2020 or later, the CO2 cylinder exchange return window has been extended to 60 days so you can refill your gas at your own schedule.