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