Line sets

Line sets consist of two 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 3/8" (LL). The larger pipe is referred to as the suction line 3/4", 7/8" or 1 1/8" (SL), and includes insulation. They are Manufactured in accordance with the American Society for Testing and Materials (ASTM) Standard Specification B280.