The MRCOOL DIY16-1412-O is a 16-foot, pre-charged line set designed for compatible MRCOOL DIY ductless mini-split HVAC systems using R-454B refrigerant. Featuring 1/4-inch and 1/2-inch copper tubing, it connects the indoor and outdoor units, allowing refrigerant to circulate efficiently between them for heating and cooling. The pre-charged design simplifies installation by reducing th... https://www.partshnc.com/mrcool-diy-5th-gen-16ft-1-4-x-1-2-line-set-r-454b-diy16-1412-o