Which option best completes the phrase: A four-way valve operation is used to supply water to hoses.

• A. Drafting
• B. Standpipe operations
• C. Water supply
• D. Multiple attack lines

Answer: (C)

This question focuses on how water is moved from the source to the attack lines on the fireground. A four-way valve helps the pump operator route water from the supply source into the hoses and direct it to the right discharge paths as needed. The main idea is establishing and controlling the water supply to the hose lines, which is why the completion is about providing or managing the water supply.

Drafting refers to drawing water from a static source into the pump, which is a different part of the process. Standpipe operations deal with delivering water through interior building hose systems, a more specific scenario than general hose water supply. Multiple attack lines describes using more than one hose, which is a consequence of a water supply setup rather than the function of the valve itself. The four-way valve’s purpose is to facilitate supplying water to hoses, making “Water supply” the most accurate fit.