The MRCOOL DIY16-3858-O DIY 3/8 x 5/8 Pre-Charged Mini Split Line Set is a 16-foot refrigerant line set designed for compatible MRCOOL DIY mini-split HVAC systems. It connects the indoor air handler to the outdoor condenser, allowing refrigerant to circulate efficiently between the two units for heating and cooling. Featuring 3/8-inch and 5/8-inch lines with Quick Connect fittings, it... https://www.partshnc.com/mrcool-diy-line-set-diy16-3858-o