Portable gas delivery device

A method of treatment, comprising:

• providing a device, the device comprising:
• (A) a coupling portion configured to be directly coupled to a portable gas container;
• (B) a manifold configured to be directly coupled to the coupling portion, the manifold including:
• (i) a primary outlet port configured to direct a gas from the portable gas container towards a user or a treated person or patient;
• (ii) a primary inlet port configured to allow the gas from the portable gas container to flow into manifold, the primary inlet port being in fluid communication with the primary outlet port;
• (iii) a secondary inlet port configured to allow a secondary gas source to be coupled to the manifold, the secondary inlet port being in fluid communication with the primary outlet port;
• and
• (iv) an additional port in fluid communication with at least the primary inlet port and the primary outlet port;
• (C) a (i) grommet seal and/or (ii) a disc valve or umbrella valve positioned at least partially within the primary inlet port;
• (D) a selectable gas release component that is configured to controllably engage a valve of the portable gas container, the selectable gas release component extending through a sidewall of the manifold;
• and
• (E) optionally a first cap removably coupled to the additional port and/or a second cap or a one-way valve coupled to the secondary inlet port;
• and
• delivering rescue breaths to the user or a treated person or patient through the secondary inlet port, either through the one-way valve or after removing the second cap, wherein the rescue breaths are provided by a manual resuscitator.