Geberit 1120mm Duofix Frame Delta20 Flush Plate: - Compact design - Suitable for use with wall-hung pans The smart way to install sleek modern looking wall-hung toilets is with Geberit Duofix frame systems. Neatly concealed behind the wall, they're the perfect solution for every style, shape and space - from standard installations to under a window or sloping ceiling. Duofix Frame Strong, secure and flexible, the frame systems sit within pre or dry wall installations bolted to the floor, supporting the sanitaryware and keeping it firmly in place. With Geberit Duofix, it's easy to create a great contemporary look in any bathroom or cloakroom. Large small flush options The best thing about a dual flush cistern is the ability to choose between a small or a large flush. Small.