Diving Mask, Full Face 11
Diving Mask, Full Face 11 : Features: (5) Bailout Arrangements: There are several approaches to bailout air supply which can be used with a full-face mask: Bailout gas may be supplied via a bailout block. This is the same system used for diving helmets. The main gas supply to the mask passes through a non-return valve to a bailout block and then to the demand valve. An alternative gas supply is connected to the bailout block through a valve which may be opened by the diver to allow use of the bailout gas. This does not allow supply of bailout gas to another diver. This system is used for most full face masks, as they have no other option. For scuba diving with a full face mask, a gas-switching block is sometimes used to supply different gas mixes to the second stage in the mask. A bailout or reserve supply is then available via the switching block and a buddy's block may be connected via an intermediate pressure hose to share gas. This has the advantage that both divers are always breathing the same mixture in an emergency, reducing the chance of one diver inadvertently breathing a mix beyond its maximum operating depth. A secondary demand valve can be fitted to some full-face masks. The Draeger Panorama (and the Apeks Panorama) have a port (P-port) on each side which can be used for this purpose. The demand valves of these masks can be unclipped on the surface to allow breathing of atmospheric air, and can also be removed underwater to clip in a secondary supply carried either by the diver of by a buddy carrying compatible equipment. This system also allows for gas switching for decompression if enough of the appropriate demand valves are available. The Kirby Morgan 48 Supermask allows the demand valve pod to be unclipped and another clipped on, or a standard demand valve can be used if the pod is left off while it is in use. When this is done the diver inserts the mouthpiece into his mouth in the usual way though the large opening left by the removal of the pod
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