The MRCOOL DIY35-1412C-O DIY 5th Gen 35 Ft Pre-Charged Line Set is a factory-charged refrigerant and communication line assembly designed for MRCOOL DIY 5th Generation 9K, 12K, and 18K BTU ductless mini-split systems. It uses a 1/4-inch liquid line and 1/2-inch suction line to circulate R-454B refrigerant between the outdoor condenser and indoor air handler. https://www.partshnc.com/mrcool-accessory-5th-gen-pre-charged-mini-split-line-set-35ft-diy35-1412c-o