The MRCOOL DIY25-1412C-O is a 25-foot pre-charged copper line set designed for MRCOOL 5th Generation DIY mini-split systems with 9,000, 12,000, and 18,000 BTU indoor air handlers. It connects the indoor air handler to the outdoor condenser, carrying R-454B refrigerant through 1/4-inch liquid and 1/2-inch suction lines for efficient heating and cooling. Quick-connect fittings simplify ... https://www.partshnc.com/mrcoolr-diy-line-set-diy25-1412c-o