StacksVerified U.S. regulatory reference

46 CFR §122.610

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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.