Aqua Lung MISTRAL Owner's Manual page 13

AquaLung 1 GB 12/08/05
The position of the mouthpiece relative to the second stage diaphragm is essential to
avoid free-flows at the surface or in the water when the mouthpiece is not in your mouth:
- When the mouthpiece is situated above the second stage diaphragm, the regulator
will free-flow. This is caused by the difference in hydrostatic pressure between the second
stage and the mouthpiece.
- Inversely, when the mouthpiece is situated below the second stage diaphragm, the
regulator will not free-flow.
It is recommended that you keep the mouthpiece in your mouth from your entry into the
water until you leave the water in order to avoid free-flows.
On entering the water at the beginning of the dive you can adjust the comfort of the
mouthpiece by rotating the corrugated hoses. The hoses are correctly adjusted when you
do not feel the mouthpiece on your gums :
- If you turn the mouthpiece adjusting lugs downward then the mouthpiece will lay
against your lower gums (photo 1),
- If you turn the mouthpiece adjusting lugs upward then the mouthpiece will lay
against your upper gums (photo 2).
Photo 1
14:33 Page 13
Photo 2
Regulator Owner's Manual
GB
13