Rear Pressure Bulkhead
Behind all the trims & carts, is one of the most important elements of an a/c, the Rear Pressure Bulkhead. Located between pax cabin & tail, it is responsible for sealing the rear of the aircraft & maintaining cabin pressure.

On A320, it holds a pressure of upto 128 lbs/sq inch
Image Courtesy : Premium AERO TEC
The rear pressure bulkhead forms an airtight barrier between the passenger cabin and the tail section, maintaining the correct air pressure and ensuring a safe flight (it also carries structural loads, e.g., torsional loads from the VTP).
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