DC 311 Aqueous Film Forming Foam (AFFF) Transfer Station Operator Practice Test

The key idea is that hose reels in this system are controlled by the Master SOPV—the central valve that enables or disables flow to all hosereels from one point. Other SOPV types are designed for different control scopes: Remote operates from a distant location, Local is tied to a nearby device, and Group handles a subset of lines. None of these are the single valve designated to operate the hose reel system as a whole, so the Master is the correct one for hosereels.