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Kazikree Posted on10:12 pm - Oct 2, 2012

There are two types of Acapella Valve. The green or high flow valve is for users who can exhale at 15 liters per minute or more for at least three seconds. This works for most users. If your lungs are lower volume, you can use the blue or low flow valve. To use, simply— 1. Breathe in and out regularly through the valve 5 times.