MRCOOL DIYCOUPLER-1412K75C Communication Cable Line Set Coupler Kit is an accessory designed to connect and extend compatible line sets and communication cables in ductless HVAC installations. It works by creating secure connections between refrigerant piping and communication wiring, maintaining proper refrigerant flow and reliable electrical communication between indoor and outdoor ... https://www.partshnc.com/mrcool-diy-line-set-coupler-kit-diycoupler-1412k75c