MRCOOL DIY50-3858C-O DIY 24K & 36K BTU Line Set with Pro Cable 50 Ft is a pre-charged connection line assembly designed for compatible MRCOOL DIY mini-split air conditioners and heat pump systems. It works by providing a sealed pathway for refrigerant flow between the indoor and outdoor units, while the integrated Pro Cable ensures reliable power and communication. https://www.partshnc.com/mrcoolr-diy-line-set-diy50-3858c-o