Vacuum tube especs:¦µ47¡Á1.5m¡¢¦µ58¡Á1.8m Vacuum tube amount:15/18/20/24/30 The material of the inner tank :0.5mm imports304food and one grade of stainless steel board. Heat preserviation :50-60mm polyurethane foam. The material of the cover tank :Whether American flash aluminium
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