Abstract: A gas concentrator adaptable for use within a breathing apparatus, particularly for use within a resuscitator, Trach T, patient tee, or a high oxygen concentration mask. The gas concentrator distributes gas into the resuscitating device through a substantially elongated member that has a number of perforations at one end and a stopper at an opposite end. In addition, the gas concentrator has one or more air check valves that are in fluid communication with the reservoir of the resuscitating device and the atmosphere. A front manifold is used to couple the reservoir to a patient breather apparatus which regulates the flow of oxygen or gas to the patient.