CAC unknown piping

I have never seen this before on a central air conditioner CAC and a furnace together. The furnace had a humidifier removed at some point. The CAC Liquid line has 2 thin copper lines that attach to the insulated vapor Line a foot or so away. What is this ??

Metering device (TXV valve).

Dom.

Never saw one before, very interesting. Thank you very much !!