We're about six years into our new bathroom and on our third dual flush mechanism. The plumber was unable to get a new seal and had to replace the whole cistern last time. Being boxed in didn't help. It cost £lots. He didn't rip me off as it was my son in law ! He showed me the old seal and it had a swelling that let the water through. You could see the ripples in the bowl but next time, I'm just gonna leave it, no meter here !
I had never heard of this system and would have much preferred a regular ballcock...I can fix them !
Ted
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