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 ... requirements.4, good insulation properties: air conditioning is needed to connect pipe insulation, and to improve the air conditioner's energy efficiency, should further improve ...