... the CE certificate and pass the SGS test! 1,Copper tube:O.D. 1/4'',3/8'',1/2 ... B7435,Thickness of copper tube compatible any gases:R22,R407C,R410A,R404A,R507C etc.6,PE insulation pipe:I.D. ... from Φ8 to Φ22.7,PE insulation pipe:thickness from 8mm to 10mm.8,Character:Anti- ... UV,good heat resistance,low water absorption9,Insulation pipe can be printed with letter. Insulated Copper Tubes