Push the purge button on the front of our regulator to simulate a free flowing regulator. A regulator will free flow at full strength so remember to push the button all the way in.
Continue to breathe by sipping air from the stream that is rushing past your mouth. It sounds difficult, but you'll find that it's very easy and comes completely naturally.
Your instructor will have you breathe from the free flowing regulator for at least 30 seconds.