Hi, My toilet bowl is Bellavista brand and came with the apartment. Recently, the water flow became very slow and the WC took very long to fill up (and flush is not strong). My not very 'handy man' husband managed to unscrew the lid and removed the mechanism. He concluded that the rubber (what do you call it) is slightly torn and water is rushing out from that part. I think he is right as we compared this with another WC that is working fine. Where do we get a replacement for the rubber (a black ring-like shape)? Do we need to change the whole internal mechanism (checked with neighbourhood h/w shops but none have)? Anyone knows which shop carries Bellavista brand?