Pillar Hydrant (Fire Hydrant) is normally used by the fire service. It's made of ductile iron or cast iron aaccording to BS 750 Fire Hydrant (Pillar Hydrant) -made of ductile iron or cast iron aaccording to BS 750 --Ms. Livia Wang QINGDAO VALTECH MANUFACTURING CO., LTD. Jihongtan Town, Chengyang District, Qingdao City, Shandong Province, China