MRCOOL DIY16-3858-O DIY 3/8 x 5/8 Pre-Charged Mini Split Line Set 16 ft is a refrigerant line set designed to connect compatible 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 operations. Designed for use with MRCOOL DIY ductless mini... https://www.partshnc.com/mrcool-diy-line-set-diy16-3858-o