air conditioner copper pipe 1)Copper tube:OD:1/4,&3/8,&1/2 ... 4,6,7,10, air conditioner copper pipe Twin/pair insulated(isolated) copper tube/pipe Our product have got the CE certificate ... and pass the SGS test!1,Copper tube:O ... : GB/17791--1999,JISH3300,ASTM B7435,Thickness of copper tube compatible any gases:R22,R407C,R410A,R404A,R507C ...