DN25 DN50 DN100 DN150 DN200 Black or Gi ERW Low Carbon Fence Post and Construction Steel Pipe - China ERW Steel Pipe, ASTM A53 Steel Pipe | Made-in-China.com
NPS - 'Nominal Pipe Size' and DN - 'Diametre Nominal'
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Ductile Iron Pipe of China DN150-DN1000 EN545/EN598/ISO2531 High Quality - Okorder.com