Except for coated and plated nozzles, the nominal release
temperature range should be colour-coded on the nozzle to identify
the nominal rating. The colour code should be visible on the yoke
arms holding the distribution plate for fusible element nozzles, and
should be indicated by the colour of the liquid in glass bulbs. The
nominal temperature rating should be stamped or cast on the fusible
element of fusible element nozzles. All nozzles should be stamped,
cast, engraved or colour-coded in such a way that the nominal rating
is recognizable even if the nozzle has operated. This should be in
accordance with table 1.