Geberit Sigma 75/Sigma 8 Cistern Outlet Valve

Is this the right Geberit Valve? The Sigma 75 is a specific “slimline” valve. To confirm it fits your cistern, look for the following:

• The Sticker Test: Remove your flush plate. Look inside the cistern carcass for a white sticker. If it has the number 109.75X.00.1 or 111.75X.00.1 (where X can be any number), this is your valve.

• The Year: Common in Australian homes built or renovated between 2004 and 2013.

• The Tank Model: Specifically fits the UP700 and Sigma 75 concealed cisterns.

Genuine Geberit Replacement Part Often referred to by plumbers as the “Rocket Valve” due to the distinct shape of its top assembly, the Sigma 75 outlet valve is a complete flushing unit. If your Geberit in-wall toilet is leaking water into the bowl, replacing this valve is the most comprehensive fix.

Why replace the whole valve?

• Total Refresh: While you can replace the 8cm washer, the internal plastic levers and rods in older Sigma 75 units can become brittle. A full valve ensures the mechanical action is crisp and leak-free.

• Splash Control: Includes the adjustable throttle settings to prevent water from splashing out of modern rimless pans.

• Includes Components: Comes complete with the rods, levers, and the upper “rocket” attachment for immediate installation.

The easiest way to tell if this is the right cistern outlet valve from Geberit is if there is a sticker on the back of cistern carcass that is behind the push plate and the number has the following digits:

109.768.00.1, 109.767.00.1, 109.795.00.1, 109.794.00.1, 109.796.00.1

• Q: My toilet is running, do I need a whole new valve?

  • A: If water is trickling into the pan, start by replacing the Geberit Outlet Washer. However, if the water is overflowing into the bowl from the top of the valve, your Inlet Valve is likely the culprit. If the flush is “sticky” or won’t trigger, this full outlet valve is the solution.

• Q: Is this the same as the Sigma 80 or Sigma 120?

  • A: No. The Sigma 75 is specifically for 75mm/80mm thin-wall cisterns. It is narrower than the standard 120mm (Sigma 12) models. Always check your sticker code inside the tank.

• Q: Does it come with the blue basket?

  • A: This part is the valve body and the blue basket (cradle) at the bottom of the tank.

The X may have a variety of different numbers to replace it but this doesn’t matter. as long as the other numbers are correct, you have the right product.

For this valve, it comes with two packets of the blue rods, shorter ones for pre 2015, and longer pair for post 2016. This valve is commonly called the Typ 208 which also suits Alpha.

Video for installation below: