The MRCOOL DIYCOUPLER-3858K75C DIY 24–36K BTU Line Set Coupler Kit is designed to extend compatible MRCOOL DIY mini-split HVAC systems using existing line sets. It connects refrigerant lines securely while including a 75-foot communication cable for reliable communication between indoor and outdoor units. Ideal for DIY-series ductless heat pumps and air conditioners, this kit simplifi... https://www.partshnc.com/mrcool-diy-line-set-coupler-kit-diycoupler-3858k75c