Try a hammer arrestor. Look up Sioux chief on the internet, they have
arrestors especially made for toilets.
Ron

"nr" wrote in message
oups.com...
After my Fluidmaster equipped toilet finishes filling, I get the water
hammer sound. From research, it appears to be caused by the F's fill
valve. Can this be corrected or do I have to replace the entire
assembly? Can the fill valve be replaced? Any other relatively easy
solutions?

Thanks for any info.