All the parts of Compact , most of which are patented, can be found on this regulator. The performance is extremely high, although the calibration is regulated so that the inhalation effort is slightly greater than on the Compact , to prevent any self-regulating possibility when it is used as a spare regulator. Octopus XS Compact suits all the Cressi first stages perfectly and all the first stages with an intermediate pressure between 9 and 10 bar.