How many of you use ballcocks with plastic shanks...i.e. regular 400A? How many use supply lines with plastic nut? Will you use a metal nut on a plastic ballcock shank?
I have ONLY used the "regular" 400A fill valve for over 40 years. I use the locknut that comes with the valve, so asking about a metal nut is irrelevent. I also use the regular Fluidmaster supply line with the plastic nut.