A trapezoidal mixer is used for fast-reactive injection media, in which all material-carrying parts are made of the highest quality stainless steel to prevent corrosion. Two material hoses transport components A + B to the static mixer in the mixing pipe via 2 ball valves. During injection, both valves are opened and closed simultaneously via a one-hand mixing lever. The two ball valves can be used to flush the valves of the A and B components separately.