Saint-Gobain
Kuboat
US PILE and Foundry Company
Jindal SAW
Electro-steel Steels
McWayne
American Cast Iron Pipe Company
Kurimoto
Xinxing Ductile Iron Pipes
Benxi Beitai
Rizhao Zhufu
Angang Group Yongtong
Shandong Ductile Pipes
Shanxi Guanghua
SUNS
Jiangsu Yongyi