... ,tubeDia32mm,Dia40mm,Dia50mm,Dia75mm,Dia110mm,Dia160mm,Dia200mm,Dia250mm. 1) American standard (ASTM Sch 40 & Sch 80, SDR 21, SDR 26, SDR41 ... 6742, JIS K 6741, JIS K 6743, JIS K 6739)6) National standard (GB 10002, GB 5836, GB 14823, GB 13664)7 ... ) International standard (ISO 4422, ISO 3633, IEC 614, GY 3050) Besides,the ...