... mmSection Shape:RoundOuter Diameter:4 - 18 inchPlace of Origin:Shanghai China (Mainland)Secondary Or Not:Non-secondaryApplication:Fluid PipeTechnique:ERWCertification:CESurface Treatment ... Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray .Payment100% irrevocable L/C at sight or 30% T ...