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Line sets consist of two 15 feet semi-flexible copper pipes to connect the outdoor air conditioner or heat pump to the indoor evaporator coil. The smaller pipe is called the liquid line (LL). The larger pipe is referred to as the suction line (SL), & both pipes are encased with thick insulation. The tubing is easily connected by the pre-flared fittings without the need to solder. They are Manufactured in accordance with the American Society for Testing & Materials (ASTM) Standard Specification B280. This line set included 18 feet of 14-4 AWG 600v wire for connecting the indoor evaporator to the outdoor unit.