A special box for empty walls. Its special feature is mounting in an empty wall, with the embedded side. After drilling a mounting hole Ø 68mm, the box is fixed in the regips or panelling with four screws. The extended flange of the box enters the hole to the depth of 12 mm. The box can be deepened by means of the PD60x30 spacer ring or fixed with extended screws 25mm or 40mm. The openable bottom of the box allows for efficient insertion of cables.