During inspection of a fire suppression system, what is the only visual clue that the system is a wet chemical or a dry chemical system?

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Differentiating a wet chemical from a dry chemical system on inspection comes down to how the agent is released and distributed. The wet chemical system uses a liquid agent that is sprayed through specialized discharge heads, so the nozzle assemblies are designed to deliver a liquid over the cooking surface. A dry chemical system, by contrast, releases a powder, and its nozzles are designed to distribute or channel particulate material. Because the rest of the hardware—vals, connections, and tank sizes—can look similar across different systems, the nozzle type is the reliable visual clue that tells you which kind of agent is being used.