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View of the helmet visor sealing system valve.

The valve on this helmet differs from the flight configuration. Other helmets on display (e.g., Slayton's and Grissom's) have flight-type helmet visor sealing system valves.

For additional information on how this valve functioned, see the "helmet" section of my Mercury suit info page.

Note the provision for the attachment of the visor-seal gas supply bottle hose at the tip of the valve.