If a sprinkler is color coded Green, what color bulb does it use?

• A. Black
• B. Yellow/Green
• C. Orange/Red
• D. Blue

Answer: (A)

Sprinkler heads use a color-coded glass bulb to indicate the activation temperature. The color on the head is a quick visual cue that tells you which bulb color should be used to match that head’s rating. In this standard, a green-coded sprinkler corresponds with a black bulb, so selecting the black bulb ensures the system will activate at the intended temperature for that green head. Other head colors align with their own bulb colors to represent different ratings, but the green head-specific pairing is black in this coding scheme.