Caesar Romano wrote:
I have a toilet shut-off valve that I want to install. It has a
compression fitting on the valve outlet that goes to the toilet bowl.
I notice that the compression ring (sleeve) shape is not exactly
symmetrical, so I'm thinking that the compression sleeve has to be
installed in a specific orientation.

Which end goes toward the compression nut? The HD guy said it doesn't
matter. I'm skeptical of that.

The brass rings for copper tubes are symmetrical and can be installed either
way. I have seen the plastic rings for plastic supply tubes that have a
wedge cross section, in these you put the flat portion towards the nut so
that the thin edge jams in between the pipe and the valve fitting to seal
it.