Which of the following is NOT a listed use for 2½ inch hose?

• A. Supply lines
• B. Cross-lay decorative piping
• C. High-rise and large structure
• D. Denver packs

Answer: (B)

2½ inch hose is chosen for situations that require a strong water volume and reliable flow on the fireground. It’s commonly used for supply lines to move water from hydrants or pumps to larger attack lines, and it’s well suited for high-rise or large-structure operations where bigger flows are needed. Firefighters also carry 2½ inch hose in Denver packs so they have a ready-to-deploy line at hand for rapid attack or supply.

The phrase “cross-lay decorative piping” isn’t a real function of firefighter hose. Cross-lay refers to a method of preconnecting an attack line for quick deployment, not to any decorative use. That’s why it isn’t considered a listed use for 2½ inch hose.