Where is the expiration date on a CO2 tank?

The expiration date on a CO2 tank is typically found stamped or labeled on the neck or shoulder of the tank, often near the pressure relief valve. It may also be indicated on a sticker or a metal plate attached to the tank. The date is usually formatted as a month and year, indicating when the tank needs to be requalified or retired from service. Always check local regulations and guidelines for the specific requirements regarding CO2 tank inspection and expiration.