MRCOOL DIY25-3858 DIY 3/8 x 5/8 25 ft Line Set is a pre-charged refrigerant line set designed to connect compatible 24K and 36K BTU MRCOOL DIY mini-split indoor and outdoor units. It works by providing a sealed pathway for refrigerant to circulate between system components, enabling efficient heat transfer for cooling and heating operation. Designed for use with MRCOOL DIY ductless mi... https://www.partshnc.com/mrcool-diy-line-set-diy25-3858