Noisy Toilet ?

I recently discovered this newsgroup and have a question. I have two upstairs bathrooms with a wall separating the two toilets (Kohler & American Standard). The toilets sit back to back against the same wall. This past summer one of the toilets(Kohler) start leaking at the base. I had a plumber replace the wax ring beneath the base of the leaky toilet. While doing so, he replaced the supply line which was a gold metal one with a plastic supply line since he could not get the alignment correct and needed the flex of the plastic supply line to make the connection.
Now the problem/noise.... ever since the repair, when the Kohler toilet is filling up after a flush, a high pitch sound/squeal emits from the pipes in the wall. If you go in the other bathroom, when flushing the Kohler it is very loud. Actually you can hear it throughout the house. The Kohler itself is not unusually loud when filling up, just the water flowing in the pipes in the wall. When flushing the American Standard, the noise is not that loud when in the other bathroom. Weird.....
Any ideas???
THANKS!!
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could be the flexable suppy line is kinked,,and creating the noise try checking for kinks, and remove supply,and reroute to different angle

could be the shutoff valve washer is loose,, or debris is clogged in valve replace valve, or remove and tighten washer
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Flexable supply line is ok. It is only 5 inches long , no kinks.
I will investigate the shutoff valve..washer, debris.
Thanks!
runningwater wrote:

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Sometimes just closeing the stop a little will solve it. If you have high water pressure like city water then this could happen.
Sounds like the stop has an issue though, prob didnt like being used after all this time.

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