Uni Flange The ductile iron flange is dilled to PN10, PN16. Uni FlangeThe ductile iron flange is dilled to PN10, PN16. --Ms. Livia WangQINGDAO VALTECH MANUFACTURING CO., LTD. Jihongtan Town, Chengyang District, Qingdao City, Shandong Province, China Uni Flange