The MRCOOL MC25-3858 Olympus & Advantage 24K BTU 3/8" x 5/8" 25 ft. Flared Line Set Kit is a pre-flared refrigerant line set designed to connect compatible MRCOOL Olympus and Advantage 24,000 BTU ductless mini-split systems. It provides a secure pathway for refrigerant flow between the indoor air handler and outdoor condenser, ensuring efficient system performance. https://www.partshnc.com/mrcool-25ft-flared-line-set-kit-mc25-3858