The ADV/MAV is mounted to the side of the inhalation counterlung. It utilizes a built-in demand valve that is activated by negative loop pressure against a diaphragm, similar to a standard second stage regulator. It can also be manually activated by pressing directly on the diaphragm.
The ADV’s position allows it to feed diluent gas directly to the DSV. This provides a fast, hands-free method of receiving a known breathable gas as well as supplying additional gas to increase loop volume.
The ADV/MAV comes with a standard LP inflator hose fitting to allow the use of any off-board diluent gas supply. For dives exceeding 130 ft (40 m), Dive Rite recommends upgrading this fitting to a high-flow quick disconnect QC-6 fitting. Contact Dive Rite for details.
An inline shutoff is included to disable the ADV. However, be aware that this also disables the MAV. The shutoff should be used if the diluent gas supply is disconnected underwater to prevent water from entering the ADV/MAV.