... certified, igh efficiency, reliable quality, inner tank TIG welding, super stainless steel, easy installation, competitive price.Vacuum Tube: Dia.47/1500 ... , 60pcs, 120pcs;Inner tank: Food class SUS 304 2B stainless steel sheet with thickness of 0.5mm;Inner tank Dia ... sides argon protection welding. No corrosion;Outer tank shell: Stainless steel, Al-An zinc steel sheet, or Anit-corrosion Fluorine ...