Uncommon blue metal Apollo pressure helmet feed port made by Air Lock, 1″ thick and 1.75″ in diameter, with part numbers on port, "PN-2526, SN-392," and part numbers on cover, "ASSY, A6L-102006-05, ASSY 9184, SN-1321." The port cover features two strips of Velcro. In fine condition. The feed port gave astronauts the ability to pass a food or water valve, later called a Contingency Feeding System, into the helmet area in the event the crew had to stay pressurized inside the suits due to an emergency.
