... got the CE certificate and pass the SGS test! 1,Copper tube:O.D. 1/4'',3/8'',1/2'',5 ... 1.1/8'',1.1/4'',1.1/2''2,Copper tube:thickness from 0.5mm to 1.5mm.3,Length: 3 ... meters4,Standard complied: GB/17791--1999,JISH3300,ASTM B7435,Thickness of copper tube compatible any gases:R22,R407C,R410A,R404A,R507C etc ... I.D.from Φ8 to Φ22.7,PE insulation pipe:thickness from 8mm to 10mm.8,Character:Anti-UV,good heat ...