I have been given free access to fire extingushers. My company recently added on 90,000 square feet and replaced all our old extingushers. They are only a year old. How easy it to convert these into something for our uses. What kind of hardware would I need to attach a regulator to it? Any information you could provide would be appreciated.

Do you have a manufacturer and model number? Or a photo? If they use the same connection as the CO2 bottles we use, then they would be directly interchangable.