Arrangement for breathing apparatus, and breathing apparatus

An arrangement for a breathing apparatus, the arrangement comprising:

• a breathing device;
• a primary connection point for fluid communication with a primary container;
• a secondary connection point for fluid communication with a secondary container;
• a primary side arranged between the primary connection point and the breathing device;
• a secondary side arranged between the secondary connection point and the breathing device;
• a first valve arranged between the primary connection point and the secondary connection point, the first valve being arranged to automatically close a first fluid connection between the primary connection point and the secondary connection point when a secondary pressure in the secondary side decreases below a first pressure threshold such that the first valve operates as a one-way valve by (i) when in an open configuration, providing pressurized gas from the secondary connection point to the primary connection point, and (ii) when in a closed configuration, inhibiting pressurized gas from flowing through the first valve;
• a second valve arranged on the secondary side, the second valve being arranged to automatically establish a second fluid connection between the secondary connection point and the breathing device when a primary pressure in the primary side decreases below a second pressure threshold;
• a primary shut-off valve arranged between the primary container and the primary connection point;
• and
• a secondary shut-off valve arranged between the secondary container and the secondary connection point.