Drum pumps range from simple siphon based devices to sophisticated highly-engineered machinery.
Low cost manual pumps are used when product dispensing is periodically needed.
Double-action piston drum pumps can be self priming, delivering liquid on both the forward and the back stroke.
This configuration allows the drum to be emptied without tipping and so reduces the risk of spills and operator injury.
This might include open-head drums of hot-melt adhesive, heavy grease, etc.