The MRCOOL DIY16-1438-O is a 16-foot pre-charged line set designed for MRCOOL DIY 5th Gen 6K, 9K, and 12K BTU mini-split systems. It includes a 1/4-inch liquid line and 3/8-inch suction line, carrying R-454B refrigerant between the indoor air handler and outdoor condenser. Quick-connect fittings support a faster, cleaner installation without field charging the lines. https://www.partshnc.com/mrcool-diy-5th-gen-16ft-1-4-x-3-8-line-set-r-454b-diy16-1438-o