I am about to replace the water control SmartValve in an American Standard
Champion toilet. (The waterflow does not shut off at end of filling up the
tank.) American Standard was good enought to send me a replacement part
(Fluidmaster, adjustable) under warranty coverage, but no instructions
included.

Since I have never done this before, I would like to know if any type of
sealant is required ? and, if so, what should be used and where should it
be applied?

TnX.