The assembly has a body, the body has first and second surfaces on opposite sides. A number of holes, extending through the body between the plane of the first and second. Each opening is provided at both ends thereof to the tubular liner multiple, each liner is removably attached to the hole of the body. Closing means of the first to close the opening of the liner at the first surface of the body. Closing means and the second to close the opening of the liner in the second surface of the body. By closing means of the first and second can be fixed to the body, the laboratory is specified in the liner, respectively.
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