hiwe need Good Quality Durable Anti corrosion Thermal Insulation Steel PipeType:BushingMaterial:AlloyTechnics:ForgedConnection:WeldingShape:EqualHead Code:roundThickness:4-16 mmTechnique:ERWSpecial pipe:Copper CoatedStandard:BS 1387,GB/T 9711.1-1997,GB/T 3091-2Alloy or not:Is AlloyGrade:10#,20#,45#,Q235,Q345,Q195,Q215,.....Surface treatment:HDPE or FRPcertificate:ISO, API , SGS Show More