46 C.F.R. § 97.37-13

Fire extinguishing system controls

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The control cabinets or spaces containing valves or manifolds for the various fire extinguishing systems must be distinctly marked in conspicuous red letters at least 2 inches high: “[STEAM/CARBON DIOXIDE/CLEAN AGENT/FOAM/WATER SPRAY—as appropriate] FIRE APPARATUS.”.

[USCG-2006-24797, 77 FR 33881, June 7, 2012]