SUS304 Bolted Wastewater Tanks from a Factory: Specs and Supply An SUS304 bolted wastewater tank is a stainless steel vessel assembled from factory-fabricated SUS304 panels with A4-80 stainless bolting for hygienic, corrosion-resistant storage. Grade 316L is specified where chlorides are high. Built under EN 1090 and AWWA D103-09 by Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel), these tanks serve food, pharma, and clean-industrial wastewater at 20-5,000 m3.