This pack contains a replacement auto capsule and a 38g CO2 cylinder to fit the Crewfit/Crewsaver 180N Auto Inflatable Lifejacket. The Pro Sensor Elite Automatic Inflator allows the user one point of status indication to confirm that the unit has been automatically or manually activated. The unit also provides the additional benefit of detecting if the CO2 cylinder has been pierced, removing the chance of accidentally fitting an empty gas cylinder.