Replacing Geberit 280 and 250 Twico 1 and Twico 2 with the new 290 valve

The new Geberit 290 valve is a  replacement for the popular Twico 1 and Twico 2 valves which are now  being phased out. Please note, the full and half flush buttons are supposed to go down together. The difference is that the half flush button will go down a little further causing only half the water to flush (provided you have set the flush as described in the video).
This valve can be purchased here:
https://toiletspares.com.au/collectio...
If you have a problem after installing this valve, you may have damaged it putting it in. We have a video here on how to fix that:
Fixing a broken or sticking Geberit 2...
I would recommend watching this video before adjusting or installing this valve.

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