... 1-5-3-6-2-4 Brand :steyr Manufacture:China Heavy Duty Truck Group Co., Ltd.Numbers of cylinders: ... :4----------Tank material :Carbon steel, stainless steel, lined with rotational molding, glass, steel, plastic jar (polyethylene). One-time roll- ... forming manufacturing processes, mechanical horizontal weld, computer controlled automatic molding head designed, inside and outside the full butt welding, ...