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]