Air-operated grease guns use compressed air to deliver a consistent flow of lubricant. Also called pneumatic grease guns, they attach to an air compressor and are often paired with bulk tanks and loading methods to provide a steady supply of lubricant for high-volume applications. These grease guns lubricate machinery and equipment in industrial, aerospace, and agricultural settings with high-lubricant needs and where an air compressor with a power source are within close proximity.