What must be included with each drain valve fitted in a lifeboat?

In the context of lifeboat safety, each drain valve is required to be accompanied by a cap or plug that is securely attached by a lanyard or chain. This requirement is critical for ensuring that the drain valve remains sealed when the lifeboat is not in use, thereby preventing water ingress that could compromise the buoyancy and integrity of the lifeboat. The lanyard or chain provides a safeguard to ensure that the cap or plug does not get lost or misplaced, thus maintaining readiness and safety for immediate deployment during emergencies.

Having a secure closure for the drain valve contributes to the overall safety of the lifeboat, enabling it to remain effective in a situation where it might be needed for evacuation or rescue. This aspect of lifeboat design aligns with maritime safety regulations aimed at minimizing risks associated with lifeboat operations.