... box,surface box,distribution box ,surface box , mounted box ,wall box 2) sizes: 3"x3",3"x6"box, 20mm/25mm knockouts3) ... no smell attracting rotent ,will no suffer from biotic attack.2)Good insulation characteristic ,good insulation property,good fire-resistant3) ... during the process of construction ,electrical equipment , components12)PVC 2 gang box are used as surface mounting ,control box , switch ...