46 C.F.R. § 78.47-17 Fire extinguishing system controls.
Title 46 - Shipping
(a) The control cabinets or spaces containing valves or manifolds for the various fire extinguishing systems shall be distinctly marked in conspicuous red letters at least 2 inches high—“STEAM FIRE APPARATUS”, “CARBON DIOXIDE FIRE APPARATUS”, “FOAM FIRE APPARATUS”, “WATER SPRAY FIRE APPARATUS”, “MANUAL SPRINKLING SYSTEM”, or “AUTOMATIC SPRINKLING SYSTEM”, as the case may be. (b) [Reserved]
Title 46: Shipping
PART 78—OPERATIONS
Subpart 78.47—Markings for Fire and Emergency Equipment, Etc.
§ 78.47-17 Fire extinguishing system controls.

