We may have found other answers which could help you.
Click here for Water Inner System
Replacement of bellows in Grohe air button?
Grohe push button toilet attached to saniflow ?
How do I remove the fitting for the flush on my hidden cistern toilet?
GroheEAU2 Dual flush cistern. The large flush button keeps breaking off?
Have I been charged way to much for having a loo mended?
Grohedal flushing?