A low permeability coupling device for coupling a first endpiece ( 3 ) extending a tube ( 2 ) with a second endpiece ( 10 ) carried by the wall ( 1 ) of a member to which the tube ( 2 ) is connected, in which the second endpiece ( 10 ) has two substantially coaxial walls ( 11, 12 ) defining between them a blind annular housing ( 13 ) for receiving the first endpiece ( 3 ), and a sealing element ( 15 ) extending between the inside face ( 11 a) of the outer wall ( 11 ) of the second endpiece and the outside surface ( 8 ) of the first endpiece when it is in place in the above-mentioned housing ( 13 ).
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