We could supply double-wall copper brazed tube according to ASTM A254 The out diamater 3.18-12mm Wall thickness 0.5-1mm, tolence of wall thickness: +/-0.08mm, Tensile strength: Above 290MPA, Yielding point: Above 180MPA Elogation: Above 20-28% Note: Tube interred keep pressure by 1.5mpa acridine We can produce all kinds of double-wall copper brazed tubes which under O.D.8*0.7m, O.D.4.76*0.5m. We also could supply double-Wall copper plating, Single-Wall Steel Tube with single-wall copper plating and Bright Steel Tube