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Detail of one of the umbilical hoses entering the suit's helmet.

Picture 1 of 2.

I was unable to find any reference material regarding the suit's helmet, but I speculate that this black-ringed device is some sort of relief valve. Note the actuator cable with the oversized disc at the end, presumably to allow for easy use by gloved hands.

 
Vostok (SK-1) Suit helmet umbilical hoses at Apollo:  When We Went to the Moon
Time picture taken Thu Nov 7 17:37:22 2019
Location picture taken Apollo: When We Went to the Moon Exhibit
Space Hall
"Old" Museum
U.S. Space & Rocket Center
Huntsville, AL
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