Simple to operate via its easy-to-use control panel, the M 122 allows manual switchover from pressure-free start to full-load operation to ensure gentle and reliable compressor start-up even under cold conditions. For added flexibility, the 10, 12 and 14 bar versions enable infinitely variable pressure adjustment down to 5 bar via a manual wheel control on the proportional controller. As the M 122 is equipped as standard with a 1900 kg chassis, a truck is not necessarily required to tow the unit.