Stretch out the flexible tubing with the mouthpiece, then connect the side without the mouthpiece to outlet. The outlet is on the bottom right-hand side of the base.
[header] How to use an incentive spirometer [title] Put the incentive spirometer together, if necessary. [step] If you haven't used the device before, you may need to assemble it. Wash your hands, then remove the pieces from the plastic bags.