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Roman Pliskovskyleft a comment
This is a mask of an entirely new technological class
Periscopic Mask & AdapterSafest snorkeling mask with periscope&air-tank adapter
The Mask - is an upgrade from the wide variety of existing leisure full-face masks to a new class device of adventure, sport, and rescue. Two mirrors are in the top of the tube and on the glass inside the mask. 26 modifications to ugrade the safety. We added to the mask an adapter for a mini air-tank & made it suitable for a speed.
Periscopic Mask & AdapterSafest snorkeling mask with periscope&air-tank adapter