We "shake" our extinguishers here at the nuclear plant at least once every month.....then again we are a bit conservative when it comes to anything safety related.
We also have a LOT of C02 extinguishers which are nice to have around because there's not much up keep.
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2002 Key West 2300 Bluewater
Yamaha 225 OX66
 2003 F250 Crew Cab Fx4 7.3L Turbo Diesel
Take a Fish Boating!
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