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This is leaking from the top valve and needs replacing - but how on earth do you get the moving top mechanism off? I'd rather not change the feed pipe if I can. The notched pipe from the bottom from cistern is fixed - the rest moves up and that but off the top as far as I can work out.
Turning off the water is a nightmare.
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I would guess it is not designed to come apart. Probably a throw away part and is one part to the external fitting. Worth having a prod though. You'll need the water of either way. I'd turn the water off then for an isolator valve to make future jobs easier.
Usually a full replacement.
😳 Posted from my phone in the pub earlier. Should say: [i]You'll need the water off either way. I'd turn the water off then fit an isolator valve to make future jobs easier.[/i]
Just replace it with a fluidmaster, isolate water add valve for future maintenance. Flush cistern drain rest into waterproof bag or soak up remaining water. looks like a lab sanitary button syphon and bottom entry float.
If you purchase the fluidmaster set you have a spare syphon too as it will fit onto existing hardware without removing cistern to replace .
Do you know what it is? When I eventually found out exactly what system mine was a very helpful video on YouTube showed me the really quite obvious quick release clips to get it apart.