... 4, (2) Length:3,4,6,7,1 Air Conditioner tube(1)Copper tube:OD:1/4,&3/8 ... needed to connect pipe insulation, and to improve the air conditioner's energy efficiency, should further improve the connection ... to allow the same design pressure are 13.0Mpa, 13.0Mpa is the air pipe system 3 times ... than brass soft, copper-aluminum connecting pipe copper tube design is 1.5 times the wall thickness, not only ...