In-wall WC frame GEBERIT Duofix Sigma H112 for wall-hung toilet, model 111.320.00.5

GEBERIT Duofix Sigma H112 in-wall WC frame (model 111.320.00.5) is a pre-assembled installation frame designed to carry wall-hung toilet bowls and to house a concealed cistern within a stud or solid wall. The frame provides a robust mounting structure and integrates with flush plate mechanisms to enable a flush, space-saving bathroom appearance. It is intended for use in both residential and commercial sanitary installations where a suspended toilet solution and concealed plumbing are required.

Advantages

The Duofix Sigma H112 frame offers stable support for wall-hung toilets and simplifies installation by combining mounting points and concealed cistern accommodation in one unit. Its design allows for adjustable height positioning of the toilet bowl and provides a secure connection to the drainage system. The in-wall configuration reduces visible plumbing, supports a clean bathroom aesthetic, and can improve accessibility and cleaning under the bowl. Materials and construction are intended for long-term use in standard sanitary environments.

Suitable for

• New builds with stud or solid walls where a suspended toilet is required
• Bathroom renovations aiming to conceal cistern and pipework
• Residential and commercial bathrooms seeking space-efficient sanitary layouts
• Installations requiring adjustable bowl height and secure wall mounting

Key specifications

• Pre-assembled metal installation frame for wall-hung toilets
• Height suitable for standard wall-hung toilet mounting with adjustable settings
• Integrated concealed cistern interface compatible with flush plate operation
• Designed for installation within stud walls or fixed masonry walls
• Connection points for waste outlet and water supply in concealed configuration
• Corrosion-resistant components for typical sanitary room conditions

How to use

Install the Duofix Sigma H112 frame into the prepared wall opening or stud construction following the structural guidelines for load-bearing fixation. Secure the frame to the floor and wall according to installation distances and mounting points, connect the waste outlet and water supply, and attach the concealed cistern interface and flush plate mechanism. Adjust the height and lateral position of the toilet bowl mounting brackets as required, then fit the wall-hung toilet bowl and test for correct alignment and leak-free operation before closing the wall and fitting the flush plate.

Usage recommendations

Confirm compatibility of the frame with the chosen wall-hung toilet bowl model and flush plate system before installation. Use qualified installers for structural attachment and plumbing connections to ensure safe load-bearing performance and compliance with local codes. Inspect seals and connections for leaks during commissioning and perform periodic checks after installation.