What size "pony" intake lines should be used when connecting the pumper to the hydrant?

The use of 3-inch "pony" intake lines when connecting the pumper to the hydrant is preferred because these lines strike a balance between flow capacity and maneuverability. A 3-inch line can provide sufficient water flow for most suburban firefighting operations while remaining manageable for firefighters during deployment.

In urban and suburban settings, where hydrants are often spaced reasonably and the demand for water can vary significantly, the 3-inch line allows for an adequate supply without being overly cumbersome. Larger lines might be more challenging to handle and position in varied environments, especially when rapid response is critical. Additionally, a 3-inch line can efficiently fill the pumper's tank or supply it directly during suppression activities, ensuring that crews have the water they need without excessive drag or difficulty in connecting to hydrants.

This size also aligns with standard practices in fire service operations, making it well understood among personnel. Therefore, the 3-inch option is a practical choice for connecting to hydrants during firefighting efforts.