Aqua Lung Dimension i3 / Lotus i3 BC - Manual (Page 35)

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OVER PRESSURE RELIEF (OPR) VIA FLAT E-VALVE
The Flat E-Valves also function as over pressure
relief valves.
CAUTION: The proper function of the over pressure relief valve is vital to preventing damage
to the BC bladder. Unauthorized service or tampering may render these valves inoperable
and could cause the bladder to leak or burst. This type of damage is not repairable and is not
covered under warranty.
WARNING: Most training agencies recommend that you descend in an upright feet-
first position, in order to maintain a slower controlled descent. This is especially
true if you experience difficulty equalizing your ears, or if you are descending in low
visibility conditions.