46 C.F.R. § 78.47-37 Watertight doors.
Title 46 - Shipping
(a) All watertight doors in subdivision bulkheads shall be numbered conspicuously on both sides on an etched plate or equivalent in not less than (b) Class 1 doors fitted in accordance with the requirements in §170.255 of this chapter must additionally be marked “RECLOSE AFTER USE.” [CGFR 65–50, 30 FR 16955, Dec. 30, 1965, as amended by CGD 79–023, 48 FR 51008, Nov. 4, 1983]
Title 46: Shipping
PART 78—OPERATIONS
Subpart 78.47—Markings for Fire and Emergency Equipment, Etc.
§ 78.47-37 Watertight doors.

