Fireboy CG Series Automatic Marine Fire Extinguisher wHeavy-Duty Bracket Helm Display This Fireboy marine fire extinguisher protects engine rooms and machinery spaces by automatically discharging at 175 F 79 C. This extinguisher comes equipped with a heavy duty mounting bracket and a 2 helm display. This boat extinguisher uses FK-5-1-12 a widely used clean agent, as a replacement for Halon, this helps use lower concentrations of the agent to prevent fires. This clean agent requires no clean up