LG LSC27910sb refrigerator freezer door water line broken
I see what you mean, I couldn't find anything either. That black collar looks like a push-in connection. See if you can get LG on the phone or a Chat on their website to walk you through extracting it first.

Plan "A" would be to remove the hose after the split &amp; cut a new end at or before the split to just shove it in &amp; be good as new. It's likely very similar to a Sharkbite connection. Where you may have to insert a thin tiny flathead screwdriver (or 2) or a plastic or metal sleeve into that collar about an inch to push up the locking rings for the hose to actually just fall out.