46 C.F.R. § 185.610 Watertight doors and watertight hatches.
Title 46 - Shipping
Watertight doors and watertight hatches must be marked on both sides in clearly legible letters at least 25 millimeters (1 inch) high: “WATERTIGHT DOOR—KEEP CLOSED” or “WATERTIGHT HATCH—KEEP CLOSED”, unless such markings are deemed unnecessary by the cognizant OCMI.
Title 46: Shipping
PART 185—OPERATIONS
Subpart F—Markings Required
§ 185.610 Watertight doors and watertight hatches.
