McMaster 4287N11 Quick-Prime Lever-Grip Grease Gun

Start greasing faster than standard grease guns and continue with the high output of a lever grip. These guns use vacuum pressure instead of a spring, rod, and follower plate, so they’re ready to go more quickly. A cap seals the bottom of the gun to create vacuum pressure and to prevent grease from leaking and making the gun slippery. They have a lever grip, so they dispense about twice as much grease per stroke as pistol-grip guns. But you’ll need both hands to dispense grease.

These guns aren't compatible with cardboard grease cartridges because they use vacuum pressure.