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  2. Aft pressure bulkhead - Wikipedia

    en.wikipedia.org/wiki/Aft_pressure_bulkhead

    The aft pressure bulkhead is the white circular component; its web-like structure led a NASA technician to attach a large model spider to it for comedic effect. The aft pressure bulkhead or rear pressure bulkhead is the rear component of the pressure seal in all aircraft that cruise in a tropopause zone in the Earth's atmosphere. [ 1 ]