46 CFR §169.747
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Each watertight door and watertight hatch must be marked on both sides in at least 1-inch letters: “WATERTIGHT DOOR—CLOSE IN EMERGENCY” or “WATERTIGHT HATCH—CLOSE IN EMERGENCY”, unless the markings are deemed unnecessary by the Officer in Charge, Marine Inspection.