Geberit Essential Trio – 3 flush seals | Twinline 8 concealed toilet | Ref: 816.179.00.1, 894.082.00.1, 240.771.00.1 | #5

This essential kit is installed in Geberit concealed cisterns: Twinline 8 single flush, 10.700, 10.500 / 10.520, 10.600 / 10.620

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I have listed here the symptoms requiring the replacement of these 3 seals:

The seal

1st symptom:
Small bubbles form on the surface of the gasket. These bubbles may resemble a small blister on your hand. Their random placement impairs the seal and causes a leak into the toilet bowl. This phenomenon is a defect. The only solution: replace the gasket.

2nd symptom:
The gasket is whitish. The true "color" is transparent/opaque, but over time and with wear, the gasket turns white. This condition is often accompanied by a ring of limescale that interferes with the seal. Because the gasket's surface is damaged, limescale builds up more quickly, causing more regular leaks in the bowl. I recommend replacing it if you find it in this condition.

Manufacturer reference:816.179.00.1

The profiled joint

Symptom:
It's squashed. This seal is the most vicious I know... It looks like it's in good condition. To understand, you need to have a new seal next to it. Let me explain: the profiled seal (when new) has a well-flared outer lip, which allows it to be perfectly watertight when installed at the bottom of the tank. But over time, the lip squashes against the basin (white basket on which it is installed), letting water through and creating a leak in the bowl. This phenomenon is accentuated by limescale. It's quite simple, I recommend replacing this seal at each maintenance.

Manufacturer reference:894.082.00.1  

The membrane seal

1st symptom:
It's tearing. With repeated opening and closing of the float valve, the seal eventually tears. This tear forms around the large cross-shaped lug. There's no choice but to replace the seal.

2nd symptom:
The gasket is whitish. The true "color" is transparent/opaque, but over time and with wear, the gasket turns white. This condition is often accompanied by a ring of limescale that interferes with the seal. Because the gasket's surface is damaged, limescale builds up more quickly, causing more regular leaks in the bowl. I recommend replacing it if you find it in this condition.

Manufacturer reference:240.771.00.1
Outer diameter: 29 mm