The easy breathing 742 series twin cartridges were developed to provide optimal respiratory protection in non-IDLH industrial or HAZMAT situations. The low profile, swept back cartridge design ensures optimal field of vision and allows use of communications. The 742 series is available in a full range of NIOSH approved, chemical cartridges or combination cartridges. Attaches directly to XCEL Halfmask and Promask full facepiece. Uses Quarter turn adapter when used with AV Series Facepieces