Koerb is 100% correct on the metal head issue and simonsrf those 2 packs at Costco, Sam's, BJ's, Wal*Mart, Kmart and Target are the plastic heads. Typically the brand name is Kidde. They will serve in a pinch but in the long run spend the extra bucks. I know of 2 good brands with metal heads. They are Amerex and the Ansul Sentry. There are others but those 2 came to mind as they were brands I once sold. Check your phone book under Fire Extinguishers for dealers who not only sell the better brands but service them as well. NONE of the stores mentioned above service fire extinguishers.
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