Simulated oxygen breathing apparatus

A modified personal breathing apparatus for training use having a breathing bag, a face mask, flexible tubing connecting said face mask and breathing bag such that air is exhaled into said breathing bag, and a canister designed for cooperative insertion into said apparatus in fixed relation thereto, wherein the improvement comprises:

• means within said breathing bag for storing high pressure air including two cylinders containing said high pressure air, each cylinder having an outlet;
• means for reducing said pressure of said air to a breathable level including a plurality of regulators connected in series, each having an input and an output, and that together have an inlet and an outlet, with the input of the first regulator in said seves defining said inlet, the output of the first regulator connected to the input of the second regulator, and the output of the second regulator in said series defining said outlet of said plurality of regulators, and a tubular conduit means connected to the outlet of each said cylinder and downstream therefrom to the inlet of said plurality of regulators for providing a single air passage to said plurality of regulators that is common to both said cylinders;
• selectively removable closure means operably connected at the outlet of said plurality of regulators for obstructing the flow of air therefrom;
• flexible tubing connected at one end thereof to said closure means and at the opposite end thereof to said face mask, operably providing a passageway for air from said closure means to said face mask;
• and
• actuating means within said canister removably connected to said closure means for selectively removing the closure means from between the flexible tubing and the reducing means, permitting the flow of air between said reducing means and said flexible tubing.