Noisy Fill of Toto Toilets

Terry,

Based on your recommendation of Toto, we purchased 3 Toto Toilets, 1 having a G-Max and the other 2 having Power-Gravity Fill Valves.

All three have worked exceedingly well over the past 5 years, but now we notice that the toilet with a G-Max fill valve is now very noisy when it refills,
and are just beginning to hear similar refilling noise on one of the Power
Gravity fill valves.

Question: Is there anything that can be done to the valves - outside of ordering new ones and replacing them - to eliminate the noise that is now
heard when they refill ?

Is this a common occurrence - after 5 or more years of use?

Many thanks,
JimLF

There is a $2.50 part that may need replacing.
Lowes carries them on the shelf, a Korky Quietfill replacement assembly cap.
They can be replaced in less than a minute, without tools.

https://terrylove.com/korky/

Korky 528T Replacement TOTO Toilet Fill Valve - Fits G-Max and Power Gravity Toilets -Easy to Install -Made in USA