Lubricant pumps (sometimes called grease pumps) move large volumes of oil, grease, or other lubricants from a storage container or reservoir. They provide operator control of the lubricant flow rate and allow dispensing exactly where needed. They're often used for applying lubricant onto moving machinery parts and into hard-to-reach areas. Air-operated grease pumps run on compressed air to dispense grease more consistently and with less effort than manual grease pumps. Bearing packers (also called grease packers) remove old grease from ball or roller bearings and refill them with new grease. Manual grease pumps are portable, hand-powered pumps. Oil pumps dispense oil from a container to machinery or transfer oil to small containers or reservoirs.