Normally EN598 ductile iron pipe fitting is for sewage water.The ductile iron pipe fitting type,dimension,connection etc is same as EN545/ISO2531 Ductile Iron Pipe Fitting,the only difference is the surface coating.

En598 ductile iron pipe fitting with High Alumina cement (also called Aluminate cement ) inside,red epoxy paint outside.

High alumina cement is high strength, heat and corrosion resistant cementitious material with the main characteristics of high temperature and corrosion resistance,so it is suitable for sewage with Impurities, corrosive liquids, and high temperature liquids.