ductile iron pipe 1.The standed:ISO2531/EN545,Class:K8/K9/K10 2.cement mortar lining acc.to ISO 2531-98 3.Type: T-Type,N-Type ductile iron pipe: 1.The standed:ISO2531/EN545,Class:K8/K9/K102.cement mortar lining acc.to ISO 2531-983.Type: T-Type,N-Type ISO2531 ductile iron pipes class k9