Hydraulic tampers pummel their foot against loosely packed material to compact it. Also known as pole tampers, they are commonly used to set asphalt patch and pack soil around newly installed utility or fence poles. These hydraulic tampers deliver smoother performance and higher force than air-powered tampers, are lighter than gas-powered tampers, and require less effort than manual tampers. They are self-lubricating to provide a long lifespan and minimize maintenance.