... '',3/8''&5/8'',3/8''&3/4'',1/2''&3/4''2,Copper tube:thickness from 0.5mm to 1.5mm.3 ... gases:R22,R407C,R410A,R404A,R507C etc.6,PE insulation pipe:I.D.from Φ8 to Φ22.7,PE insulation ... ,Character:Anti-UV,good heat resistance,low water absorption9,Insulation pipe can be printed with letter. Insulated copper pipe(tube)