2) Interior tank:  Made of imported food grade SUS304-2B stainless steel with 0.4mm thickness   

3) End cap: Plating zinc plates outer buckle

4) Bracket: 30 x 30mm stainless square tube

5) Thermal insulation level: 55mm imported polyurethane overall froth foaming by high Pressure foaming machine 

6) Exterior diameter: 420mm, 470mm