Why don't technical divers use full face masks?

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mblazer:
Not sure if these are similar to the ones from Chipola, but these are what I use with the gas switch block: Page Title

They have a twist locking feature to minimize the risk of accidental blowout.
Click to expand...

Similar, just not as expensive. The ones I sell have a twist lock feature as well. The black collar you see is the locking mechanism.
 
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