The MRCOOL DIY25-1412C-O DIY 9K, 12K & 18K BTU 25-ft Line Set with Pro Cable is a pre-assembled connection kit designed for compatible DIY ductless mini-split air conditioning and heat pump systems using R-454B refrigerant. The line set carries refrigerant between the indoor and outdoor units, while the included Pro Cable supports electrical communication and power connections. Its DI... https://www.partshnc.com/mrcoolr-diy-line-set-diy25-1412c-o