What is the function of a spanner wrench?

The primary function of a spanner wrench is to tighten or loosen fire hose couplings. Fire hose couplings are essential components that connect different lengths of hose or attach the hose to a water source, such as a hydrant or a pump. A spanner wrench provides the necessary leverage to securely fasten or detach these couplings, ensuring that they are properly sealed during firefighting operations to prevent water leaks and maintain pressure.

Using a spanner wrench is vital for firefighters, especially during high-pressure situations where every second counts. The design of the wrench allows for effective engagement with the various types of couplings used in fire hoses, making it an indispensable tool in the fire service.

Other options, such as adjusting bolts on fire trucks or repairing hoses, do not align with the specific design and purpose of a spanner wrench, which is focused solely on hose couplings. Opening hydrant valves requires different tools and techniques, further emphasizing the specialized nature of the spanner wrench in the context of firefighting equipment.