On Tuesday, April 23, 2019 at 5:41:19 PM UTC-5, son_of_flubber wrote:
What are 'White LS sleeves'?

I think "white ls sleeves" are white colored plastic clips which are one method of preventing L'hotelier connections from accidentally coming loose. Wedekind sleeves , clips, or safety wire and correctly drilled holes are other methods.

http://aviation.derosaweb.net/wedekind/

Nice writeup with pictures,