Geberit Optimal Trio – 2 mechanism and basin seals, float valve, hose | Twinline 12 concealed dual flush toilet | Ref 816.418.00.1, 240.282.00.1, 240.705.00.1, 240.989.00.1 | #3

This optimal kit is installed in Geberit concealed cisterns: Twinline 12 double flush, Twinline 8 double flush

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I have listed here the symptoms requiring the replacement of these 2 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.

3rd symptom:
The gray seal ref: 816.418. This reference is part of a black series from Geberit. It bubbles, much more than the others, as in the first symptom. I do not recommend keeping this seal, even if it does not yet have bubbles.

Manufacturer reference:816.418.00.1
Outer / inner diameter: 63mm x 32mm

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:240.282.00.1
Outer/Inner Diameter: ≈70mm x ≈53mm

The float valve

Symptom:
Worn away by limescale. If the float valve diaphragm is new and it's still malfunctioning, it's because the limescale has become too encrusted. There are several possible consequences:

• It constantly fills the tank (which eventually flows into the overflow).
• It no longer fills the tank.
• It fills the tank very slowly.

In either of these cases, I recommend replacing the float valve.

Blue and white float valve reference:240.705.00.1
Flexible reference:240.989.00.1