Inlet openings made of flexible material. The cable or tube installation is performed by extracting the pre-pressed inlet to the flexible membranes and then inserting the required item into the opening. Installation box in the hole is made by tightening mounting screws. Air proofed even with inserted cable or pipe. Suitable for low energy and passive houses. The fixing screws as well as the instrument screws are double-threaded for quick installation; the box has plastic flanges. The connecting pieces for the assembly of boxes with pitch 71 mm are part of the set; during assembly it is necessary to remove the pre-marked part of the box edge. When mounting, it is not necessary to countersink the plasterboard edge. The IP30 protection a box fitted with an appropriate lid or a device with a higher or equal IP30 protection. Boxing with 71 mm axial spacing can be done with the SKLD 2 coupling (not included), when joining, it is necessary to tear off the pre-marked part of the box rim. Protected by a European industrial design trademark.