The MRCOOL DIY16-1438-O is a 16-foot pre-charged refrigerant line set designed for MRCOOL DIY 5th Generation 6K, 9K, and 12K BTU ductless mini-split air conditioning and heat pump systems. It features 1/4-inch liquid and 3/8-inch suction lines with quick-connect fittings for a secure and convenient connection between the indoor air handler and outdoor condenser. https://www.partshnc.com/mrcool-diy-5th-gen-16ft-1-4-x-3-8-line-set-r-454b-diy16-1438-o