... coated then bitument painted. 5.DN80-DN2000 1.Ductile iron pipe2.ISO2531 standard3.EN545 EN598 standard4.Zinc coated then ... bitument painted.5.DN80-DN2000water supply ductile iron pipeISO2531,EN545,EN598 Class : K9SIze : DN80-DN1200Inner cement line ... ring as per ISO46337) High strength, lighter than grey iron, good corrosion resistance, no furring small flow resistance, easy ...