Universal floor box with holding claws size 2 428x428x(50-80)mm. Universal floor box according to DIN EN 50085-1 and DIN EN 50085-2-2 suitable for all duct widths up to nominal size, with flexible foil formwork, holding claws, assembly protection cover and internal stepless height leveling, acoustically decoupled, minimization of cracks in the screed in the installation area through movable bearings.