The MSA AirXpress 2 Fire Basic Unit is a simplified, durable, and economical self-contained breathing apparatus (SCBA) designed for firefighting and other hazardous environments. It meets EN 137 Type II standards and is built with a rugged backplate, a reliable AX demand valve with adjustable flow, and an integrated warning whistle. The harness features strap zippers that allow switching the pressure gauge and demand valve between sides. With a minimal-electronics design, it’s easier to maintain and ideal for demanding use.