Cleaning a grease fitting is a difficult and tedious task. The Grease Joint Rejuvenator lets a technician unclog joints in just a few seconds, without having to remove the fitting, and/or disassemble the joint to properly grease it. By forcing light oil into the joint, the tool flushes out old hardened grease and allows the new grease to be pushed through. The Professional model comes with the Professional Model Grease Joint Rejuvenator, 5-in. flex hose for hard-to-reach fittings, and an extra coupler. A pocket model works the same as the professional model, but is small and especially handy for small equipment.