... DN2000 K7 to K12 2m to 7m in length k9 flanges ends ductile iron pipes ISO2531 EN545 EN598 ductileiron ... EN5453) BV product conformity certificate 1) ductile iron pipe k9, according to iso2531 or en545, push in type joint ... class k9,2) outside zinc coating and then bitumen coating ... pvc film,or according to customers' request k9 flanges ends ductile iron pipes