The IMPA 335777 "This door must be kept closed" sign is a crucial safety tool that meets the standards set by the International Maritime Organization (IMO). This durable and highly visible sign is essential for alerting crew and passengers to the importance of keeping certain doors closed at all times while on board a ship. The sign features clear and bold lettering, making it easily readable from a distance. Manufactured to meet strict safety regulations, this sign is an essential addition to any maritime safety kit. Ensure compliance with maritime safety standards by prominently displaying the IMPA 335777 "This door must be kept closed" sign in the appropriate areas of your vessel.