Thanks to its thread, the brush head can be exchanged easily and in a few simple steps, the head fits the following Zeller Present models: 18319, 18401, 18406, 18414, 18416, 18421, 18426, 18484, 18565, 18687, 18708, 18776, 18784, 18785 , 18786, 18828, 18842, 18855