Flush-mounted device box with airtight membrane inlets, for use in masonry with an installation depth of at least 46 mm. . 4 x 3 screw domes . Connecting piece with bayonet lock that can be connected on both sides . 4 combined pipe inlets 20 and 25 mm . 2 inlets up to 20 mm in the connecting piece . 2 inlets up to 12 mm in the floor