Radiation suction boxes for a suction device (6) of a device (1) for the water-jet fixation of a fibre-based rail (2),in particular a non-woven linen, with at least one slit-like coat aperture (20) leading to its inner space (17) on its outer casing (14) having a hollow suction box (18), that the suction box (14) on its cover (18) has at least one suction nozzle (23) with a slit suction aperture (25), the width of which extends to the inside of the box (17).
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