Which of the following is NOT a feature of the pump tank water extinguisher?

The pump tank water extinguisher is primarily designed for manual operation, allowing the user to control the application of water directly to the fire. This type of extinguisher requires physical action to pump the water out, which is one of its distinguishing features. The effectiveness of these extinguishers on certain types of fires, particularly Class A fires (involving ordinary combustibles like wood, paper, and trash), further highlights their design purpose. Additionally, these extinguishers do have limitations in terms of spray distance, which can affect the user’s ability to combat a fire from a safe distance.

In contrast, automatic operation, which refers to systems that engage without human intervention, is not a characteristic of pump tank water extinguishers, making this the option that does not align with their functional design. Therefore, the fact that pump tank water extinguishers are manually operated is why automatic operation is the correct answer to identify as not a feature of this type of extinguisher.