15.1 A valve or similar fitting attached to the
side of the vessel below the waterline, shall be normally of steel,
bronze or other non-brittle fire resistant material or equivalent.
Valves of ordinary cast iron or similar material are not acceptable.
15.2 When plastic piping is used it shall be of
good quality and of a type suitable for the purpose. Any such pipe
shall be located so as to minimise the risk of accidental damage.
Where fitted within an engine space or fire risk area, a means shall
be provided to stop the ingress of water in the event of the pipe
being damaged, operable from outside the space.