Geberit Duofix 1120mm Toilet Frame With Pre Wall Fixings The sturdy metal frame supports wall hung sanitaryware and includes all the pipework required and an integral cistern which is sound insulated. Duofix allows the creation of full or half height ducts to conceal pipework and cisterns whilst allowing access to the inside of the cistern through the flush plate for maintanence. Frames are available for wall hung WCs, washbasins, bidets and urinals. They come complete with all the necessary parts to connect to the wall and floor and to make the plumbing and drainage connections.