The MRCOOL DIY25-1412 DIY Line Set is designed for compatible 9,000, 12,000, and 18,000 BTU MRCOOL DIY ductless mini-split air conditioning and heat pump systems. It provides the refrigerant connection between the indoor air handler and outdoor condenser, allowing refrigerant to circulate for efficient heating and cooling. Designed for DIY installations, this line set supports straigh... https://www.partshnc.com/mrcoolr-diy-line-set-diy25-1412