The MRCOOL DIY35-1438C-O is a 35-foot pre-charged mini-split line set designed for MRCOOL DIY 5th Gen 6K, 9K, and 12K BTU mini-split heat pump systems. It connects the indoor air handler to the outdoor condenser using 1/4-inch liquid and 3/8-inch suction lines, with R-454B refrigerant and quick-connect fittings. https://www.partshnc.com/mrcoolaccessory-5th-gen-pre-charged-mini-split-line-set-diy35-1438c-o