Help me fix the toilet - what is this part?

Good afternoon. For a very long time I did not see a similar device for the tank drain valves. This model gradually disappeared from the sales market at one time and for some period it was very difficult to find fittings of this type in small provincial cities. But now, like all the old things, she’s coming back and, by the way, she saw on the Internet foreign installations with such a descent, rather expensive, cunning sellers put them in the retro category.

As for the name, they are called differently - drain valves or drain valves. But this is what almost all such fittings are called, so when purchasing, specify that you need a drain valve on the chain for lever drain.

This is the simplest type of set / drain fitting, consisting of:

- lever (chain or tow) drain;
- drain valve lever;
- lever float;
- float;
- chains for the shutter valve;
- overflow;
- filling hose;
- adjusting screw;
- valve shut off the water supply.

If the drain valve is damaged, it ceases to fit snugly to the drain hole, and water begins to leak into the toilet. It is difficult to purchase one in small cities; ordinary button plums are more popular there. In large cities, you should contact the large plumbing stores, you can also search in online stores. It is difficult to answer exactly where, if you knew the city of your residence, you could at least help you and shop. As for the Internet, I saw exactly such a valve on Aliexpress. Moreover, such a component is very cheap there, something about 70-100 rubles. And I also saw the whole drain mechanism for 900 rubles, in the same place.

So changing the fittings, if you can choose the right size, in principle, is not required. However, to clean the installation before replacing the valve, wash off the water, dry the place and degrease it, since you still have to change the gaskets.