Plastic electrical junction box mold is fast becoming the standard material for electrical boxes, especially for do-it-yourself work. If junction box is required IP66 dustproof or IP67 waterproof, the plastic junction box will be made with double injection molding for sealing in order to reach the requirement of dustproof or waterproof. [ Reserved Hole Design ] We offer a superior waterproof performance of this outdoor electrical box. Drill holes open on your demand and make whole box keep a better sealing.