... , 360mm.c) Outer tank material: stainless steel,diameter: 420, 455, 460, 470, 480, 500.d) Insulation layer: high density polyurethane foaming ... , 360mm.c) Outer tank material: colored steel,diameter: 420, 455, 460, 470, 480, 500.d) Insulation layer: high density polyurethane foaming ...