The invention concerns a built-in device for masking in particular an electrical connection (18) in a wall (2), in particular a building floor. Said device comprises a plate (3) wherein is formed a housing (11) and a valve sealing (4) the housing. The invention is characterised in that the sealing valve bears on its outer surface a retractable pivoting shackle (6) in a recess (10) formed along the valve edge.
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