Krea Swiss is the same familiar brand/manufacturer you’ve known as Krebs. Only the name has changed. The company has not, and neither have its products. They are made by the same people, in the same country, and under the same quality controls.

Found at the back of the Krebs food spray gun, the adjustment knob controls how far the piston moves, that distance affecting the suction / amount of liquid being sprayed.

Removing/installing the knob requires dismantling the back of the gun, where the gun casing/hood is attached to the gun handle by two screws with Torx T20 heads, requiring a Torx T20 pin for removal.