Air-Operated Portable Grease Pump PackageLincoln Air Operated Portable Grease Pump Package Lincoln's new heavy duty portable grease pump delivers the same volume and pressure as the more expensive pumps but at an affordable price. Lincoln's time tested, 2 1 2", 50: 1, air operated, double acting grease pump ensures dependable, high output grease delivery. Lube the hard to reach fittings with the heavy duty control valve and universal swivel. Standard follower wipes 120 lb. drum sides clean