Except for coated and plated nozzles, the nominal release
temperature range should be color-coded on the nozzle to identify
the nominal rating. The color code should be visible on the yoke arms
holding the distribution plate for fusible element nozzles, and should
be indicated by the color 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 color-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.