Aqua Lung Micra Air System User Manual page 11

WARNING: DO NOT attempt to fill the M.A.S. from a supply
cylinder which contains more than 3,100 psi. Doing so may
weaken and damage the M.A.S. cylinder, and could cause it
to rupture and explode, possibly resulting in injury or death.
6. While holding the first-stage and fill
adapter secure, turn the M.A.S. cylinder
counter-clockwise until a single click is
felt and the ON-OFF indicator pin
can be sighted through the small
aperture marked "ON." (See Fig. 7.)
7. Support the M.A.S. cylinder with
one hand, and slowly turn the
supply cylinder valve handwheel
counter-clockwise to open and
begin filling.
NOTE: Always fill the M.A.S. as slowly as possible by turning
the handwheel of the primary cylinder valve slowly to control
the rate of fill. Rapid filling will generate heat and may result
in an incomplete fill after the cylinder cools. If the cylinder is
warm to the touch afterward, the fill rate was too rapid.
8. When at least one minute has elapsed, and air can no
longer be heard flowing from the supply cylinder into the
M.A.S., slowly open the supply cylinder valve completely.
Micra Air System Owner's Manual 11
Fig. 6 - Filling the M.A.S.
Aqua Lung International, Inc.
Fig. 7 - "On" Position