The Sundstrom. Compressed air attachment is designed for connection to Sundstrom hoods SR 520/ SR 530/ SR 561/ SR 562 visors SR 570/ SR 540 EX half mask SR 900 welding shield SR 590 helmet with visor SR 580 and welding shield/helmet with visor SR 584/ SR 580. This combination forms a breathing apparatus designed for continuous air flow for connection to a compressed air supply. Continuous monitoring of the air flow. Intended for applications involving heavy and sustained work in environments.