UN Approved!These poly drums are blow-molded from a high molecular weight, high-density polyethylene and conform to UN recommendations. Each container is optimally drainable and offers the highest level of performance and value. The 20-gallon open-head drum comes in gray only. The 15, 30 and 55-gallon open-head drums come standard with a plain lid. Bung & Vent lid available upon request. Call for other sizes and colors.