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Overall view of the helmet's vent pad, which also served as a headrest.

Picture 1 of 3.

The astronaut could close a valve in the chest umbilical area to direct oxygen to flow from the suit's vent port and 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/A7LB Pressure Helmet Assembly ("Bubble Helmet") vent pad/head rest at Apollo:  When We Went to the Moon
Time picture taken Wed Nov 6 11:36:32 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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