[Leading Manufacturer of Bolted Storage Tanks | Shijiazhuang Zhengzhong Technology Co., Ltd. Welcome to Shijiazhuang Zhengzhong Technology Co., Ltd., the leading manufacturer and expert in bolted storage tanks since 1989. Our extensive range of high-quality products includes Glass-Fused-to-Steel (GFS) tanks, fusion bonded epoxy tanks, stainless steel tanks, galvanized steel tanks, and aluminum geodesic dome roofs. As pioneers in China, we take pride in being the first manufacturer to produce Glass-Fused-to-Steel tanks and the most experienced professional bolted tanks manufacturer in As]