The black rubber dome on the underside of my toilet cistern cracked and flooded my bathroom.
- What's it called?
- What's it for?
- What measurements do I need to make to buy a new one?
- What tools do I need to replace it? (I tried to turn the hexagon thing by hand, but it won't budge.)
- How much will it cost to get a plumber to do it, and how long will it take?
When I opened the cistern it was filled with brown residue. I wiped away as much as I could; should I clean it properly with detergent, or just leave it? Also, the black rubber seal is crumbling and is leaving black stains everywhere.