Material: ductile iron  (DI). Standard: ISO2531,BS EN545, BS EN598, AWWA C219, AWWA C110, ASME B16.42. Internal lining: 1. cement mortar, 2. Sulphuric Resistance Cement, 3. Sulphuric Resistance Cement and Epoxy, 4. H.A.cement; external coated: 1. zinc and bitumen, 2. zinc and 2 epoxy coatings, 3. Metallic Zinc and a coating of suitable etching prima and 2 Epoxy Coatings, 4. zinc and PU. Suitable medium: potable water, drainage, sewage, waste water. Suitable tempreture: -40centigrade degree - 125centigrade degree. Origin: China.