Odor traps in bathtubs and shower trays must be accessible for cleaning. This was previously possible with chrome-plated inspection frames, in which tiles are fixed by a screw – seldom beautiful and often rickety. With the help of the new tile frames from Marley (1) the inspection opening can be closed invisibly. The plastic frame, installed flush in the tub support (2) becomes, fastened with permanently elastic tile adhesive. The covering tile is glued to the carrier plate with silicone. It can be larger than the carrier plate. Then press the board into the frame and grout the surface normally. To open, the grout is scraped out and the tile with a rubber suction cup (3) removed from the frame.