insulation tube of air conditioner&air conditioner pipe 1)Copper tube:OD:1/4,&3/8,&1/ ... /4, (2) Length:3,4,6,7,10m insulation tube of air conditioner&air conditioner pipeTwin/pair insulated(isolated) copper tube/pipe Our product have ... meters4,Standard complied: GB/17791--1999,JISH3300,ASTM B7435,Thickness of copper tube compatible any gases:R22,R407C,R410A,R404A,R507C ...