Which system allows firefighters to share air with another user?

The system that allows firefighters to share air with another user is known as the EBSS (Emergency Breathing Support System) Air Hose and Pouch. This system is specifically designed to enable one firefighter to supply air to another in emergency situations, such as if a firefighter runs low on air during a rescue operation. The EBSS is a crucial safety feature that can help ensure that both firefighters remain safe and operational in hazardous environments.

In contrast, while the other options relate to various aspects of firefighting safety and communication, they do not specifically facilitate the sharing of air. The Rescue Communication System focuses on maintaining effective communication in rescue situations, the Air Distribution Line is used to supply air to multiple users but not directly for sharing between individuals, and the Dual Air Supply system may involve redundant air supplies for individual firefighters rather than allowing two users to share air. Understanding the purpose of the EBSS is vital for ensuring safety and effectiveness during firefighting operations.