Which fitting is utilized for refilling the SCBA air cylinder?

The fitting utilized for refilling the SCBA air cylinder is the CGA (Compressed Gas Association) fitting. This fitting is specifically designed to safely connect air cylinders to filling stations and is standardized for filling high-pressure cylinders with breathable air. The CGA fitting ensures compatibility and safety when dealing with the compressed air systems used in SCBA equipment.

This fitting type incorporates design features that prevent accidental connections to other gas systems, reducing the risk of improper refilling. Its widespread adoption in the industry ensures that SCBA operators and refill stations can safely and reliably conduct refills without concerns about the quality or safety of the air being supplied.

Other fitting types, while useful in their specific contexts, do not share the same industry standards related specifically to SCBA equipment and air refilling, which is why they are not applicable in this scenario.