Air Conditioner tube 1)Copper tube:OD:1/4,&3/8,&1/ ... /8,&3/4, (2) Length:3,4,6,7,1 Air Conditioner tube(1)Copper tube:OD:1/4,&3/8,&1 ... to ensure the separation of water and moist air on the corrosion of aluminum tubes, life is more than 20 years.Second ... is needed to connect pipe insulation, and to improve the air conditioner's energy efficiency, should further improve the connection pipe insulation ...