What is the purpose of a hydrant wrench during a relay operation?

• A. To open and close hydrants securely and safely, ensuring proper water flow
• B. To tighten hoses
• C. To measure pressure
• D. To adjust pump RPM

Answer: (A)

During relay operations, the hydrant wrench is used to operate the hydrant valves—turning the stems to open or close the hydrant. This gives you the leverage needed to fully open the hydrant so water can flow into the relay line, and to securely close it when the supply is no longer needed or when flow must be stopped. Using the wrench helps protect the hydrant stem and threads from damage and ensures the hydrant is opened or closed completely, providing a controlled and safe water supply. This role is distinct from tightening hoses, measuring pressure, or adjusting pump RPM, which involve other tools and controls.