The device processes fats up to NLGI 2. The strong knurling ensures a secure grip. The performance of the cartridge remains unchanged after 5000 operating cycles. The loose lid with a clamping piece allows for manual assistance of the spring force in any position for compressing loose grease or for pressing the sleeve into damaged cartridges. The pump piston has a high precision fit to the cylinder, preventing false lubrication. Quick venting is achieved with a half turn of the grease gun tube. There is a separate filling and venting valve in the grease gun head. The handle on the push rod ensures safe handling.