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What you have is an automatic Halon extinguishing system designed to smother a fire within a particular compartment. As you suggest, I've usually seen them in engine compartments. Some of these systems have the bilge blower wired through them to kill the blower in the event of a fire to preserve the Halon in the compartment rather than ventilate it overboard.
I should add that this is not a dry chem, purely gaseous.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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