Geberit North America

Sigma concealed tank

For floor-mount toilets

Low Flush and 2x4 Models Now Available!
  • 109.304.00.5 Geberit Sigma in-wall installation system for floor mounted toilet with concealed tank


Geberit concealed tanks offers many of the benefits of our in-wall toilet system. It’s just the thing to replace a standard toilet when a wall-hung toilet is not possible or practical. All the working parts, including the tank and fill and flush valves, are safely and beatufully concealed inside the wall. Make a bold design statement in any bathroom!

When you pair a Geberit installation system with a compatible floor-mount washdown toilet, you get these benefits:

  • Design freedom – choose a toilet bowl from any leading ceramic manufacturer; pair with stylish Sigma series flush actuators or compatible flush buttons
  • Easy cleaning – clean the entire floor with a damp mop, no bending or kneeling
  • Improved accessibility – requires less space than a standard toilet, enhancing safety and comfort; adjustable bowl height meets personal preference or ADA guidelines
  • Water savings – built-in dual-flush: choose 1.28 / 0.8 GPF or 1.6 / 0.8 GPF to save thousands of gallons every year
  • Superior function – engineered Geberit fill and flush valves eliminate problematic chains and flappers that corrode and fail

Installation and Scope of Delivery

  • For proper stud construction (wood or steel) water supply connection, drainage and venting requirements see installation instructions
  • Includes Geberit Duofix Sigma concealed tank, water supply stop, drainage elbow, fill and flush valves pre-installed; mounting hardware
  • Requires compatible floor-mount toilet bowl to complete installation. See our Clean Design brochure for a list of compatible bowls.
  • Pair with stylish Sigma series flush actuators or compatible flush buttons (order seperately)

Water Conservation & Rebates

Systems for Floor-Mounted, Back Outlet Toilets, 2x6 Installation
Model No. Flush Volume List Price (USD)
109.304.00.5 1.6/0.8 GPF $477.00
109.307.00.5 1.28/0.8 GPF NEW! $477.00
Systems for Floor-Mounted, Back Outlet Toilets, 2x4 Installation – NEW!
Model No. Flush Volume List Price (USD)
109.797.00.1 1.6/0.8 GPF NEW! $622.00

Geberit is committed to sustainability

  • EPA WaterSense Partner
  • Alliance for Water Efficiency Charter Sponsor
  • US Green Building Council Member