In the event of a gas leak it's essential that the LPG supply can be quickly and
easily shut off. To help ensure this, a readily accessible main shut-off valve,
situated outside the accommodation space, must be fitted as close to the LPG
cylinders as possible.

Boats manufactured before 3 January 2000 that were designed and
constructed with a cylinder locker within the accommodation space are not
required to comply with the above part of this Standard.

To ensure that the LPG supply can be cut off in an effective way, the valve of
any LPG cylinder or of a connected low pressure regulator can be used as the
main shut-off valve. If there are two or more LPG cylinders connected by an
automatic changeover device, the main shut-off valve must be situated as close
to its outlet as practical.

If the shut-off valve can't be found quickly and easily by people unfamiliar with
your boat - for instance, friends or emergency staff - they will not be able to
use it in an emergency. If any valves aren't visible, or if any are hidden by doors
or lids, their positions on your boat must be clearly marked. This applies to all
main LPG shut-off valves, and each valve must indicate where other valves can
be found on your boat. [7.9]

The cylinder locker containing the cylinders and main shut-off valve can be locked when the boat and gas installation are not in use and are turned off, as long as the location of the main shut-off valve is clearly marked. When the boat is in use, ready access to the main shut-off valve is important and the locker must be kept unlocked and fully accessible at all times. [7.9]