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View of the suit's vent port.

The astronaut could close a valve in the chest umbilical area to direct oxygen through this port, where it would enter the helmet's vent pad, from where the oxygen would diffuse over the entire frontal area of the helmet, aiding in the dissipation of CO2 from the helmet area.

 
Apollo A7L Space Suit vent port at Apollo: When We Went to the Moon
Time picture taken Fri Nov 8 12:06:10 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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