46 C.F.R. § 97.37-60
Watertight doors
Quick-acting Class I watertight doors fitted in accordance with the requirements in § 170.255(d) of this chapter must be marked “KEEP THIS DOOR CLOSED”.
Quick-acting Class I watertight doors fitted in accordance with the requirements in § 170.255(d) of this chapter must be marked “KEEP THIS DOOR CLOSED”.