Hollow wall soundproofing box, windproof, D=68mm, t=58mm,The installation of conventional hollow wall boxes in soundproofing walls significantly weakens the sound insulation! With our innovative soundproofing boxes, the structural requirements of the soundproofing walls are maintained despite the installation opening, the sound is completely absorbed and thus guarantees peace and quiet in everyday life. The installation of our soundproofing boxes is as uncomplicated, quick and easy as installing a conventional hollow wall box in a standard opening of 68 mm diameter. The soundproofing function of the wall is fully retained. Subsequent installation possible. 2K membrane introduction. Installation up to 5-way combination possible. Opposite installation possible from 120mm wall thickness. Milling hole D=68mm. windproof. Ideal for renovations and refurbishments in residential buildings. Incl. 5 connecting pieces type E105 per unit. Material: PP, TPE, recyclable. Color: gray