Twin Tank Harness (Back Mount) - Aqua Lung CSAV NSW Technical Manual

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When preparing the twinpack, make sure to attach the shoulder, waist,
and back straps, as shown above.
For scuba twin cylinders configured with the Twin Tank Harness, use
CSAV strap kit PN 769097.
Attach tankbands and corresponding straps to the tanks, using the
strap kit provided.
CSAV MILITARY LIFE PRESERVER TECHNICAL MANUAL