MRCOOL DIY16-1412-O DIY 9K, 12K & 18K BTU Pre-Charged Line Set is a refrigerant connection kit designed to link compatible indoor and outdoor ductless HVAC units. It works by providing pre-charged refrigerant lines that allow efficient refrigerant circulation between the indoor air handler and outdoor condenser, simplifying system installation. Designed for use with compatible MRCOOL ... https://www.partshnc.com/mrcool-diy-5th-gen-16ft-1-4-x-1-2-line-set-r-454b-diy16-1412-o