Ideal-Air Line Sets are required for installation of the Ideal-Air 5 Ton Split System (#701706). The Ideal-Air Line Set is insulated copper refrigerant line. Tube diameters for both #700813 and #700814 are 1-1/8 in and 3/8 in. #700814 is 25 ft long and #700813 is 50 ft long. NOTE: Copper Reducer Coupling is required for line set installation. Must be purchased separately - item #700812.