I have a toilet whose main valve I replaced with a Shark, but I haven't
been able to get the metal tube from the Shark to the ball cock to fit.
Always too long, but can't get compression ring off to shorten it.

What do you all think of the Brasscraft flexible connector covered with
polymer braid? Will it hold up as well as metal? (Is the tube
chrome plated copper?) The ratings are high, but those ratings are
made between a day and a year after installation.

If Brasscraft is good, what about length? I bought 16", the only
length they had. They also sell 12" (free shipping to store). The
actual distance is 7". Using 16 means bending it around in a
complete circle. In a way that seems like it would put less strain on
the ends than using 12" which would have to bend fairly sharply at each
end, yes??? I figure if it fails it will fail at the end where the
plastic tube connects to the metal end, right?

I see now they also sell 9" and 20". 20" will be under the least
bending stress.

9" will be the most, won't it?

Finally, appearance. I've avoided using flexible because I have the
feeling it will look like a public bathroom, where they use flexible
because speed of installation is more important than looking ritzy. I
don't want my bathroom to look like a public bathroom, Even though you
can't actually see this tube without kneeling on the bathroom floor!
Maybe I should buy another metal tube and start all over again??