My kids broke the flap on one of our sockets, so I had to look into getting them replaced.
Initially I tried to make them clip on to avoid having to remove the complete socket for future replacements, but that ended up either weakening the hinges too much, or making it impossible to attach it with the spring in the right position.
The gasket and O-ring are donated from the original flap:
The original flap and the first test prints to check if I got the dimensions right:
The whole thing is over on printables
Nice,
Central vac's were pretty popular in the 90's. You don't see them that much anymore.