The MRCOOL DIY50-3858C-O DIY 24K and 36K BTU Line Set with Pro Cable is a 50-foot refrigerant line set featuring 3/8-inch and 5/8-inch copper tubing for compatible ductless mini-split systems. It connects the indoor air handler to the outdoor condenser, allowing refrigerant to circulate between components for efficient heating and cooling. Designed for MRCOOL DIY installations, it inc... https://www.partshnc.com/mrcoolr-diy-line-set-diy50-3858c-o