This specific product has a manufacturing defect. I have provided a detailed description for the Nilfisk C120 product that concerns this particular gun. In short, because its internal valve is made of plastic, after a while it opens due to improper molding at the factory and it leaks. If it breaks, get an adapter for the Nilfisk to fit a better gun with a metal internal mechanism. The adapter will fit into the Nilfisk hose and will have an M22 thread, which is the most common for spare parts.

Very good but be careful because it is the second one I bought. Repair is not worth it, so you go for a replacement.

The machine is good. However, the gun is very sensitive, it is the second one I change, with amateur use and it is not cheap.