Pre pair/single insulated copper tube/pipe Our product have got the CE certificate and pass the Rohs test! 1,Copper tube:O.D.1/4''& ... AS 15715,Thickness of copper tube compatible any gases:R22,R407C,R410A,R404A,R507C etc.6,PE insulation pipe:I.D.from Φ8 ... Character:Anti-UV,good heat resistance,low water absorption9,Insulation pipe can be printed with letter. Pre pair/single insulated copper tube/pipe