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Image: Older-generation snorkel masks

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Description: Three types of older-generation snorkel masks are illustrated. Type A: A model enclosing the eyes and the nose only. A permanent single snorkel emerges from the top of the mask and terminates above with a shut-off ball valve. Type B: A model with a chinpiece to enclose the eyes, the nose and the mouth. Permanent twin snorkels emerge from either side of the mask and terminate above with shut-off "gamma" valves.

Type C: A model enclosing the eyes and the nose only. Removable twin snorkels emerge from either side of the mask and terminate above with shut-off ball valves. Supplied with plugs for use without snorkels, as illustrated.
Author: Helmardine
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC-BY-SA-3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0/
Attribution Required?: Yes

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