Floating pneumatic device (R) to be able to be inflated on the liquid surface and that for this purpose comprises inflation means including an on-board source of pressurized gas (4) and a venturi supplied by the source of pressurized gas (4 ) and suitable to cause entrainment of ambient air which contributes to expansion device, said inflation means with venturi (3 being), mounted on a wall of said device, protected by protection means (6, 8, 9) the cover so as to define at least one labyrinth between the outside and the inflation means with venturi and to allow free passage of ambient air while preventing the liquid can penetrate significantly into the device, wherein the means protection (6, 8, 9) comprise a cover which rests on the adjacent surface of the device and comprising a substantially rigid frame (6) consisting of tubes Hinc hados pressure (7) and panels (8, 9) of watertight fabric stretched on the frame respectively defining openings (10, 11) mutually offset and constituting said labyrinth.
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