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