The Hudson RCI oxygen conserving cannula incorporates a patented "split prong" nose design and two oxygen supply tubes with standard connectors. This design provides the utmost control and comfort in synchronizing breathing with oxygen conserving regulators. It minimizes risks associated with deviated septa and occlusion by sensing pressure from both nares. It increases patient comfort by delivering oxygen to both sides. Use of this cannula requires a conserving regulator with two ports, one for oxygen devliery and one for pressure sampling.