Abstract: A self-venting waterproof container includes upper and lower waterproof body portions along with a sealing mechanism to effect a seal therebetween. A pressure relief valve provides venting communication between the interior of the container and the environment in which the container is used when there is a differential in environmental pressure and the pressure in the interior of the container. A vacuum relief valve eliminates, when opened, any vacuum existing in the interior of the container. Deformable material used for the body portions allows the container to collapse around the equipment therein under environmental pressure.

Abstract: An oxygen supply system for human inhalation of oxygen at a constant oxygen flow rate is provided including an oxygen cylinder having a pressure regulator to provide a source of pressure regulated oxygen which is passed through a fluid restrictor nozzle having a metering orifice to provide a constant volume oxygen flow to an oxygen inhalation mask through a first oxygen hose connected to the cylinder and a second mask hose connected to the inhalation mask. An oxygen flow shut-off valve is provided in a normally open position to allow oxygen flow normally from the cylinder through the hoses and through an inhalation valve in the mask to the user. A fluid pressure responsive diaphragm is provided in association with the oxygen flow shut-off valve to shut-off oxygen flow to the mask when oxygen pressure buildup in the mask hose exceeds a predetermined amount, such buildup occurring when user exhalation closes the mask inhalation valve.