Squeaky eco-Drake

Hi all,

I installed 2 brand new eco-Drakes and noticed a short "squeak" on flush. Not all the time, seems
to happen after the toilet has not been flushed in a while, like 5-6hrs.

Wondering if this is normal or if I need to do something to get rid of the noise? I noticed a few other
discussions on squeaky toto's after have been in use for a while, but these one are brand spanking
new.

Any ideas?

Some of the fill valves give a little squeak at the end of the fill cycle.

Yeah, mine squeak both at initial flush and at the end fill cycle. I think it's related to the abrupt change in incoming pressure being cut-in and cut-out. Not a big deal.. Just curious.