What is the primary purpose of the Trans-Fill Pouch?

The primary purpose of the Trans-Fill Pouch is to hold a Quick-FILL hose. This component is designed for rapid recharging of SCBA cylinders in the field. Using the Quick-FILL hose, firefighters can connect an empty cylinder to a source of pressurized air, allowing for quick and efficient refilling without the need to remove the SCBA from the user's back. This feature is crucial in maintaining operational readiness during extended incidents where multiple refills may be necessary.

The other choices, such as holding the SCBA cylinder or spare regulators, do not accurately reflect the function of the Trans-Fill Pouch. Its specific design and purpose focus on the Quick-FILL system, facilitating efficiency in air supply management during firefighting operations.