The tool is perfect, of high quality, and very easy to operate. I want to emphasize that there is a stopper switch on the front nozzle that stops it if it is not properly attached to the grease fitting we want to "push". And if we persist with excessive force, we will break it. In short, if it is difficult, do not insist, it simply has not been properly attached.

Today I got it, filled it up and realized that you need to have eaten well to grease it. It requires a lot of strength. Perfect in all other aspects (filling, waterproofing, handle). I don't know if it will loosen with use.

Very good tool with a difference from other grease guns, very good the inner rubber that seals perfectly, good ventilation in the head and with the double piston working and the tight grease easily in the positives and the cartridge that comes with it inside its box with its own nozzle and the rubber on the body of the grease gun in combination with the handle provides a firm grip even when greased. Very good function and safety of the rod during filling, the tool is worth its money and I will buy it again if needed