[David Pozzi]

Tip from my fire extinguisher guy.
Buy one with a metal valve
A standard 10 BC lasts only 15 seconds and won't put out much of a fire. A larger 30 or 60 would be much much better. I used to carry a 10BC in my car trailer, after trying unsuscessfully to put out a tractor fire with the one I carry in my work truck, I up sized the trailer to a 30BC. I have two 60BC in my shop in addition to some 10BC's. If you get one of the larger extinguishers, the ones with a hose nozzle are better.

If you are cheap and don't want to spend the money to have them serviced each year, turn them upside down & thump them with a rubber hammer & give them a shake to fluff up the powder inside. If it settles & clumps, it won't work.