The MRCOOL DIY50-1438C-O is a 50-foot, pre-charged mini-split line set with Pro Cable, featuring 1/4-inch and 3/8-inch copper lines for efficient refrigerant circulation. Designed for MRCOOL DIY ductless mini-split systems using R-454B refrigerant, it connects the indoor air handler to the outdoor condenser to support effective heating and cooling. Compatible with 6,000, 9,000, and 12... https://www.partshnc.com/mrcool-diy50-1438c-o-50ft-pre-charged-mini-split-line-set