16ft 3/8 x 5/8 Lineset for DIY 24K & 36K Indoor - R454B. Easily connect your MrCool DIY mini-split system with this 16-foot pre-charged line set designed for R-454B refrigerant. Featuring quick-connect fittings and factory pre-charged refrigerant, this line set eliminates the need for vacuuming or specialized tools — making installation fast, clean, and hassle-free.