Clear sight glass for monitoring the cleanliness of the agent. A method for determining if water content in the agent is exceeded. A pressure venting device for venting the nitrogen pressurizing agent. A mechanical filter to remove excess water from the agent. Not used for underwater breathing 10.
Hose assemblies that pass a hydrostatic test require a label or stamping on the coupling.
The first five people who answer them all correctly win a Fireline ball cap.