Yes...get the 1/16" wall thickness. A word of caution, teflon requires very good clamping to hold. A barb on the stems will help hold the teflon coupler better. Folks have JB welded a piece of wrapped wire on the pipe and header stems and installed the teflon over these barbs.

Heat the teflon carefully with a torch until it becomes clear then quickly place it over the pipe and header stems. Once it cools it shrinks nicely in place. Put a spring clamp directly over the barbed area. Be very very careful heating the teflon...work the tube around the very low flame until it starts to become clear then remove it and see what it does. It should need a little more heat to become fully clear. Don't overheat it and definitely do not scorch it or burn it. The fumes are not good for you