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What is the function of a hole on diving mask?

Updated: 8/18/2019
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13y ago

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Is it an old mask, and is the hole in the glass? If so, it could be the remains of an old-style purge valve. In that design, they put a small round rubber disk over the outside of the hole and whenever you exhaled through your nose, any water in your mask would go out the hole. Nice.

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13y ago
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Q: What is the function of a hole on diving mask?
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