Which size is the most common for large diameter hoses?

The most common size for large diameter hoses is 4 to 5 inches. This size is widely used in various applications, particularly in firefighting scenarios, as it provides a balance between flow capacity and manageable handling for the firefighters. Hoses in this range can deliver a significant volume of water, which is essential for efficient fire suppression while still being reasonable enough for one or two team members to maneuver during an emergency response.

Larger hoses, such as those in the 5 to 6 inches range, while capable of carrying even more water, become increasingly cumbersome and require more personnel to operate effectively. Hence, while they may be used in specific situations, the 4 to 5-inch size is preferred in many standard applications due to its versatility and practicality. Therefore, the choice reflecting 4 to 5 inches as the most common size aligns with the operational needs and constraints typically faced by firefighting teams.