3
4.2
Pressure release plug
To open the housing, the pressure
release plug must be first unscrewed and
then
pulled
out
all
the
way
(Counter-clockwise)
(Fig 1). This
provides a passage for the air to pass
though and eliminate the pressure
different between the inside of the
housing and the ambient. The plug
consists of an internal double O-ring seal
on the stainless steel slide shaft.
These internal O-rings form the
watertight seal. There is also a large
outer O -ring under the knob. This O-ring
serves to prevent contamination of the
slide shaft, with dirt, salt etc., and is not
required for watertight integrity. If this
O-ring should become detached, it can
simply be pushed back in place.
4.3
Opening levers:
After unscrewing and pulling out the pressure release plug, the lid can be opened. To overcome the
friction of opening, use lever (Fig. 2) to push against the lid with a cam action. Be sure they are inserted all the
way flat to the housing before turning to avoid damaging the protrusions on the lid. The body has four holes on
each corner edges for opening. Gently lever off the lid with the supplied opening lever (Fig. 3) taking care not
to twist the lid excessively. The lid should be opened keeping it approximately paralleled to the body at all
times, turn first one corner a little, then the other a little, and repeat again until the lid is opened. Remember to
unscrew and pull out the pressure release plug all the way first, otherwise the air pressure will resist attempts
at opening. Lay the lid on a flat stable surface after opening.
4.4
Special note on responsibility for watertight integrity:
Each housing is individually inspected and hydrostatically tested in the factory. The design of the
main piston O-ring seal is among the most reliable in the industry and the watertight integrity is excellent. This
special O-ring design provides a perfect seal even if there is any movement between the body and lid due to
change of ambient pressure. However please note that responsibility for ensuring the integrity of the
watertight seal lies entirely with the user. 10 BAR accepts no liability for damage to, or loss of any equipment
used with, or placed inside the housing. Users are highly recommended to carry out in-water test of the