The MRCOOL DIY35-3858C DIY 4th Gen 24K & 36K BTU Line Set is a pre-charged HVAC installation accessory designed for compatible MRCOOL DIY 4th Generation ductless mini-split systems. It works by providing a secure refrigerant connection between the indoor and outdoor units, enabling efficient refrigerant flow without requiring specialized charging or vacuum equipment. Commonly used wit... https://www.partshnc.com/mrcool-diy-4th-generation-35ft-3-8-x-5-8-line-set-diy35-3858c