Swap an empty 5lb CO2 tank for a full one – we will check the tank’s expiration date (it is stamped on the side of the tank). CO2 tanks are valid for 5 years from their last test date.

Expiration dates typically look like this:

11A23

The ‘A’ is a special symbol and will often be replaced by an individual inspector’s stamp (a few numbers) if the tank has been recertified. The first two digits are the month, the last 2 digits are the year. In this example, the cylinder was last tested November, 2023. It will expire 5 years after that, in November 2028.