Yes, tanks do have an expiration date. Tanks are good for 12yrs from their manufacture date. This date is stamped on the collar of the tank and dated with the month/year they were manufactured. In some cases tanks have been recertified and are good for 5 years from the recertification date. This date is typically stamped on the collar with a month/year followed by an “E”. Some will have stickers that are also dated with month/year followed by a “V”. If you are unsure if your tank is current, feel free to stop by and we would be happy to take a look.