Excellent product! The problems related to the grease gun coupler, mainly the issue of grease not going in but coming out around the coupler, are solved extremely and effectively. A comprehensive and excellent solution! One note. The thread of the coupler as delivered is 1/8 inch. Pay attention to the threads of the grease gun. If it is 1/8 inch, it's okay, if it's metric, M10X1, an adapter is required. Apart from this detail, greasing went from a hassle to fun! Amazing product! Worth every penny and more!