304/321/316 stainless steel u tube 1.OD:2~120mm 2.wall thickness:0.3~10mm ... 4.shape:u shaped 304/321/316 stainless steel u tube 1.Outer diameter: 2-120 mm,Wall thickness: 0.3 ... gas, beverage and food industry,environment protection apparatus, petrochemical industry,printing and dyeing,paper and sugar making, heat exchanger, boiler,medical ...