Geberit Alpha Duofix WC Frame with Concealed Cistern – 458.039.00.2

The Geberit Alpha Duofix WC Frame with Concealed Cistern (458.039.00.2) is a high-quality, space-saving installation system designed for modern wall-hung toilets. Engineered with Geberit’s renowned Swiss precision, this robust in-wall frame provides a reliable, durable solution for both residential and commercial bathroom installations.

Featuring a self-supporting, powder-coated steel frame and a pre-assembled 12cm concealed cistern, this unit is ideal for drywall construction, metal or timber stud walls, and pre-wall installations. Its versatile design makes it perfect for new builds, renovations, and bathroom upgrades.

The integrated dual-flush cistern is factory-set to 5.8/3 litres and offers adjustable flush volumes, helping to reduce water consumption without compromising performance. Advanced Geberit flush and fill valve technology ensures quiet, efficient, and dependable operation. The one-piece cistern construction minimises leak points, providing long-term peace of mind.

Compatible exclusively with Geberit Alpha flush plates, this frame allows easy servicing and maintenance through the flush plate opening. It also includes a conduit pipe for future installation of a Geberit AquaClean shower toilet or electrical connection, making it a future-ready bathroom solution.

Key Features

• Self-supporting steel frame with corrosion-resistant powder-coated finish

• Pre-assembled Geberit Alpha 12cm concealed cistern

• Suitable for wall-hung WCs with standard fixing centres

• Dual-flush technology for water-saving performance

• Factory flush setting: 5.8 / 3 litres

• Adjustable large flush volume: 4 / 4.5 / 6 / 7.5 litres

• Adjustable small flush volume: 2–4 litres

• Front actuation

• Compatible with Geberit Alpha flush plates only

• Service access through flush plate opening

• Height-adjustable galvanised support legs

• Integrated conduit for AquaClean water supply and electrical connection

• Fully insulated cistern to prevent condensation

• Immediate post-flush capability

• 25-year spare parts availability guarantee

Technical Specifications

• Product Code: 458.039.00.2

• Height: 1120mm

• Width: 500mm

• Depth: 120mm

• Frame Material: Powder-coated steel

• Operating Pressure: 0.1–10 bar

• Maximum Water Temperature: 25°C

• Flush Type: Dual flush

• Installation Type: Drywall, stud wall, and pre-wall applications

Suitable For

• Wall-hung toilets

• Metal and timber frame walls

• Part-height and full-height pre-wall installations

• Room-height partition walls

• Floor constructions from 0–200mm

Why Choose Geberit Alpha Duofix?

Geberit has over 60 years of expertise in concealed installation systems, making the Alpha Duofix range a trusted choice for installers and homeowners alike. Combining durability, water efficiency, and easy installation, this frame delivers exceptional long-term reliability while creating a sleek, minimalist bathroom aesthetic.

Please note: This frame is compatible with Geberit Alpha flush plates only and is not suitable for Geberit Sigma actuator plates.

Product Data Sheet