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An old thread but:
The information from Millenary Watches is proof of their lack of understanding.
Water can’t get past a one way HE valve mainly because it doesn’t operate when under water.
As for the manual HE valve how would a wearer know when to open it without knowing when the internal pressure is about to blow the crystal off.
Millenary Watches didn’t know the internal pressure that will activate the HEV on a Rolex but we know it is about 35 psi.
All in all a pretty useless description of an HE valve by MW.
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