If it is a metallic ball tap, when used for many years black rust and white rust will float, and if it is a common float type, the moving part has twisted and it has broken, but this is it because the whole is a plastic so it will sneak Nothing The float also moves up and down, so you do not have to say "twist". More than anything, it is very convenient to be able to adjust the amount of water immediately from directly above. Just to be careful is that the length of the piping part on the ball tap side is unexpectedly short when connecting with the pipe extending from the stopcock, so the worst thing is to extend the piping or replace it. As for me, the length was barely finished, so please be careful as it managed to install it. By the way, I sell it for about 1980 yen at this product, home center.
I exchanged the ball taps of the toilet that I have been using for over 20 years because the water stop condition worsened. I thought that the equipment had advanced a lot. I am in good health. If the sound becomes a bit smaller, it is hard to say.