Plug door
Door that seals itself using pressure difference / From Wikipedia, the free encyclopedia
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For bus and train doors known as "sliding plug doors", see Sliding door (car) and Bus doors § Sliding plug doors.
A plug door is a door designed to seal itself by taking advantage of pressure difference on its two sides and is typically used on aircraft with cabin pressurization. The higher pressure on one side forces the usually wedge-shaped door into its socket to create a seal, which prevents it from being opened until the pressure is equalised on both sides. A non-plug door relies on the strength of the locking mechanism to keep the door shut.
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