Grohe Adagio Pneumatic Push Button Bellows Service Kit 113219, Multi-Colour

Grohe Adagio push button isn't producing an adequate amount of pressure to lift your flush valve, it's more than likely that you'll need to replace this bellows. Over time the bellows may develop small fractures in it's surface as it's constantly expanding and contracting, therefore not keeping the air contained and not producing enough pressure to lift the flush valve assembly