The sound of water filling the toilet cistern, many are trying to reduce by means of rubber tubing, put on the fitting of the float valve. However, to significantly reduce noise, this measure does not help.
Much more effective silencer made from a piece of foam — cubes with the size 30x30x150 mm. It is pierced through (e.g. with a power screwdriver or tube), incision at one end and is attached to the fitting, as shown in the figure using twine or soft wire.