What is the main purpose of a spanner wrench?

The main purpose of a spanner wrench is to tighten hoses. In firefighting, spanner wrenches are essential tools used to connect and disconnect hoses and fittings securely. They are designed to fit the couplings of fire hoses, allowing firefighters to apply the necessary torque to tighten or loosen connections efficiently. This function is crucial, as a secure hose connection prevents leaks and ensures an adequate water supply during firefighting operations.

The other options, while involving tools that might be used by firefighters, do not relate to the primary function of a spanner wrench. For example, forcing windows and prying open doors typically involve different tools like pry bars or axes, and cutting chains would require cutting tools such as bolt cutters. Therefore, the correct answer emphasizes the specific role of the spanner wrench in maintaining optimal hose functionality.