What is the primary use of a spanner wrench in firefighting?

A spanner wrench is specifically designed for tightening and loosening hose couplings, which are critical in firefighting operations. In the context of firefighting, hose couplings are the components that connect hoses to each other, as well as to various water supply sources like hydrants and pump outlets. The spanner wrench provides the necessary leverage and grip to securely fasten these couplings, ensuring that they do not disconnect under high pressure during water flow.

Using a spanner wrench is essential for effective and efficient firefighting, as a proper seal prevents leaks that could hinder water delivery. It is a vital tool that every firefighter should be familiar with to ensure safety and operational efficiency during engagements.

Other options do not align with the primary function of a spanner wrench. The tool is not designed for cutting metal, adjusting water flow, or repairing fire trucks, making it clear that its primary application in firefighting is with hose couplings.