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Home Office Supplies Office Electronics Waterproof Hard Case
VEVOR Waterproof Hard Case, 20 x 16 x 5 Inches, with Customizable Foam, Portable Protective Hard Camera Case, Shockproof for Laptop, Pistol, Camera, and More, Black

VEVOR Waterproof Hard Case, 20 x 16 x 5 Inches, with Customizable Foam, Portable Protective Hard Camera Case, Shockproof for Laptop, Pistol, Camera, and More, Black

15-17 inch
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What is the center knob that turns on the front of the case do?
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This is the exhaust valve. When the air pressure in the box is too low to open the lid, the lid can be opened after unscrewing the exhaust valve to allow air to circulate. Air transport or environmental influences may cause the air pressure in the sealed box to be too low. At this time, the exhaust valve will play a role.
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