I just acquired a Kidde disposable home fire extinguisher. It is a standard dry chemical ABC extinguisher. It is still full of agent, but it is not pressurized, and the plastic “pin” is missing. I was wondering if it would be safe at all to recharge, or if it would blow up in my face. By the way, it has a plastic valve assembly. (Standard, cheap Kidde extinguisher style!) Thank you!