Barrel pumps, also known as drum pumps or container pumps, are devices used to transfer liquids from large containers such as drums or barrels. They are typically powered by electricity or manual operation and are used in a variety of industries such as chemical manufacturing, oil and gas, and food and beverage production. Barrel pumps can be made from various materials such as plastic or stainless steel and come in different sizes and designs to accommodate different types of liquids and container sizes. They can be used for dispensing, transferring, or metering liquids.