Which sprinkler color uses a Purple bulb?

• A. Blue
• B. Green
• C. Purple
• D. Red

Answer: (D)

Sprinkler heads use color coding to show their activation temperature, with the glass bulb color indicating the specific rating. In the scheme used here, a purple glass bulb corresponds to a red sprinkler head. So when you see a purple bulb, the associated sprinkler color to identify is red. Other head colors map to different bulb colors for other ratings, so they wouldn’t be paired with the purple bulb in this standard.