Our 5 gallon 4 mil pail cover dust caps with an elastic fit plastic cover protect the contents of a 5 gallon bucket from contaminants such as water, grease, dust, and other outside elements. These drum covers .004 are low-density poly covers used for covering and protecting drums, pails, and containers that are packaging products such as foods, chemicals, pharmaceuticals, and many other industrial packaging applications. Plastic drum covers for a 5 gallon drum extend the life of containers and allow for a cleaner environment when processing any product. Leak resistant.