Which of the following is not an oxygen (O2) system that can be transfilled by the oxygen generator and liquefier (OGL) system?

The Patient Oxygen Distribution System (PODS) is not an oxygen system that can be transfilled by the oxygen generator and liquefier (OGL) system. The PODS is typically a distribution system that delivers oxygen to patients but does not serve as a standalone source of oxygen that can be filled or refilled by external systems like the OGL. Instead, it is generally designed to work with more conventional oxygen supply methods, such as cylinders or central supply systems, rather than being refueled directly from an OGL system.

In contrast, the other choices listed are all systems designed for portable or therapeutic use of oxygen that can indeed be refilled or supplied by the OGL, as they are specifically engineered for that purpose. Understanding the operational capabilities and limitations of each of these systems is essential for proper usage and maintenance by biomedical equipment technicians.