Geberit Sigma8 Duofix

The Geberit Sigma8 Duofix is a high-performance in-wall cistern system designed for wall-hung toilet installations. Combining a durable one-piece HDPE tank with a strong concealed support frame, it provides reliable flushing performance, easy servicing access and flexible button options. Its 90mm wall compatibility makes it well suited to modern bathroom renovations and new builds.

Key Features & Benefits

• WELS 4-Star Rated – Provides efficient water consumption with a 4.5L/3L dual-flush system.
• One-Piece Blow-Moulded HDPE Tank – Designed for durability and leak-resistant performance within the wall cavity.
• Compatible with Mercio Wall-Hung Pans – Designed to work with all Mercio wall-hung toilet pans.
• S-Trap & P-Trap Compatibility – Provides installation flexibility for different wall-hung toilet configurations.
• 90mm Wall Compatible – Designed to fit standard 90mm wall structures.
• High 400kg Load Capacity – Provides strong structural support for wall-hung toilet installations.
• Easy Servicing Access – The dual-flush plate provides convenient access to internal cistern components when maintenance is required.
• Wide Operating Pressure Range – Suitable for water supply pressures from 10–1000kPa.
• AS 1172.1 Compliant – Designed to meet the relevant Australian toilet installation standard.
• Flexible Flush Button Options – Compatible with mechanical and pneumatic Sigma buttons, with electronic options also available.
• 30+ Button Designs – Offers extensive styling choices to coordinate the flush plate with your bathroom design.
• Concealed Installation – Keeps the cistern hidden behind the wall for a clean, minimalist finish.

Specifications

Flexible Flush Button Options

The Sigma8 Duofix provides considerable flexibility when it comes to bathroom styling. It is compatible with mechanical and pneumatic Sigma buttons, with electronic flush-button options also available. With over 30 flush plate designs, the visible flush plate can be selected to complement the tapware, fittings and overall bathroom aesthetic.

Durable Concealed Installation

The one-piece blow-moulded HDPE cistern is designed for reliable concealed installation, while the supporting frame provides a 400kg load capacity for wall-hung toilet applications. The system is designed around a standard 90mm wall, making it suitable for a range of contemporary bathroom projects.

The Geberit Sigma8 Duofix combines water-efficient 4.5L/3L flushing, durable concealed construction, flexible pan compatibility and extensive flush-button choices. It is an excellent solution for modern wall-hung toilet installations where reliability, serviceability, structural support and clean design are priorities.