Single insulated(isolated) copper tube/pipe Our product have got the CE certificate and pass the SGS test! 1,Copper tube:O.D. 1/4'',3 ... ,Standard complied: GB/17791--1999,JISH3300,ASTM B7435,Thickness of copper tube compatible any gases:R22,R407C,R410A,R404A,R507C etc ... ,Character:Anti-UV,good heat resistance,low water absorption9,Insulation pipe can be printed with letter. Insulated Copper Tube(pipe)