With the universal plaster cover P722, there will no longer be any plaster in the switch box. The signal cover, which fits all switch boxes, has an external curvature that means that significantly less plaster has to be removed and valuable time can be saved. In addition, the signal box cover can be used multiple times. For this purpose, it is designed to be particularly sturdy. Thanks to the flush-mounted cover, hardly any plaster breaks off, so that no further plastering is required. In addition, the signal cover for switch boxes remains visible even when the plaster has already been applied. A practical plaster spring is integrated for this purpose, which remains visible even when a thick layer of plaster is applied. In addition, the plaster cover from Primo can be easily pressed in by the plasterer and pops out again just as quickly. The plaster cover can be removed very easily using a box drill or by hand.